61992722787840 has 1600 divisors, whose sum is σ = 241841030308416. Its totient is φ = 15087197749248.

The previous prime is 61992722787839. The next prime is 61992722787841. The reversal of 61992722787840 is 4878722729916.

61992722787840 is a `hidden beast` number, since 6 + 1 + 9 + 9 + 272 + 278 + 7 + 84 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (61992722787839) and next prime (61992722787841).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61992722787841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 143170260264 + ... + 143170260696.

Almost surely, 2^{61992722787840} is an apocalyptic number.

61992722787840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61992722787840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120920515154208).

61992722787840 is an abundant number, since it is smaller than the sum of its proper divisors (179848307520576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61992722787840 is a wasteful number, since it uses less digits than its factorization.

61992722787840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961 (or 936 counting only the distinct ones).

The product of its (nonzero) digits is 341397504, while the sum is 72.

The spelling of 61992722787840 in words is "sixty-one trillion, nine hundred ninety-two billion, seven hundred twenty-two million, seven hundred eighty-seven thousand, eight hundred forty".