61549355952 has 200 divisors, whose sum is σ = 204772551456. Its totient is φ = 17483433984.

The previous prime is 61549355951. The next prime is 61549355981. The reversal of 61549355952 is 25955394516.

61549355952 is a `hidden beast` number, since 6 + 1 + 5 + 49 + 3 + 5 + 595 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (61549355951) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1549848 + ... + 1589064.

Almost surely, 2^61549355952 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61549355952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102386275728).

61549355952 is an abundant number, since it is smaller than the sum of its proper divisors (143223195504).

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

61549355952 is a wasteful number, since it uses less digits than its factorization.

61549355952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39417 (or 39402 counting only the distinct ones).

The product of its digits is 7290000, while the sum is 54.

The spelling of 61549355952 in words is "sixty-one billion, five hundred forty-nine million, three hundred fifty-five thousand, nine hundred fifty-two".