64680557697 has 64 divisors (see below), whose sum is σ = 112580636160. Its totient is φ = 35926612992.

The previous prime is 64680557593. The next prime is 64680557717. The reversal of 64680557697 is 79675508646.

64680557697 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 64680557697 - 2¹⁴ = 64680541313 is a prime.

It is a super-3 number, since 3×64680557697³ (a number of 33 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (64680553697) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8338773 + ... + 8346525.

It is an arithmetic number, because the mean of its divisors is an integer number (1759072440).

Almost surely, 2^64680557697 is an apocalyptic number.

It is an amenable number.

64680557697 is a deficient number, since it is larger than the sum of its proper divisors (47900078463).

64680557697 is a wasteful number, since it uses less digits than its factorization.

64680557697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8999 (or 8993 counting only the distinct ones).

The product of its (nonzero) digits is 76204800, while the sum is 63.

The spelling of 64680557697 in words is "sixty-four billion, six hundred eighty million, five hundred fifty-seven thousand, six hundred ninety-seven".