61981051320 has 48 divisors (see below), whose sum is σ = 201438417960. Its totient is φ = 16528280256.

The previous prime is 61981051309. The next prime is 61981051351. The reversal of 61981051320 is 2315018916.

61981051320 is a `hidden beast` number, since 61 + 9 + 81 + 0 + 513 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 86084434 + ... + 86085153.

Almost surely, 2^61981051320 is an apocalyptic number.

61981051320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61981051320 is an abundant number, since it is smaller than the sum of its proper divisors (139457366640).

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

61981051320 is a wasteful number, since it uses less digits than its factorization.

61981051320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172169604 (or 172169597 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The spelling of 61981051320 in words is "sixty-one billion, nine hundred eighty-one million, fifty-one thousand, three hundred twenty".