61707797680 has 40 divisors (see below), whose sum is σ = 143554218192. Its totient is φ = 24668738304.

The previous prime is 61707797651. The next prime is 61707797687. The reversal of 61707797680 is 8679770716.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (61707797687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85999 + ... + 361678.

Almost surely, 2^61707797680 is an apocalyptic number.

It is an amenable number.

61707797680 is an abundant number, since it is smaller than the sum of its proper divisors (81846420512).

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

61707797680 is a wasteful number, since it uses less digits than its factorization.

61707797680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449413 (or 449407 counting only the distinct ones).

The product of its (nonzero) digits is 6223392, while the sum is 58.

The spelling of 61707797680 in words is "sixty-one billion, seven hundred seven million, seven hundred ninety-seven thousand, six hundred eighty".