64697639417 has 8 divisors (see below), whose sum is σ = 64793332296. Its totient is φ = 64601984512.

The previous prime is 64697639401. The next prime is 64697639443. The reversal of 64697639417 is 71493679646.

64697639417 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3188183296 + 61509456121 = 56464^2 + 248011^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64697639417 - 2⁴ = 64697639401 is a prime.

It is a super-2 number, since 2×64697639417² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64697639417.

It is not an unprimeable number, because it can be changed into a prime (64690639417) 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, 6253673 + ... + 6264009.

It is an arithmetic number, because the mean of its divisors is an integer number (8099166537).

Almost surely, 2^64697639417 is an apocalyptic number.

It is an amenable number.

64697639417 is a deficient number, since it is larger than the sum of its proper divisors (95692879).

64697639417 is a wasteful number, since it uses less digits than its factorization.

64697639417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18987.

The product of its digits is 41150592, while the sum is 62.

The spelling of 64697639417 in words is "sixty-four billion, six hundred ninety-seven million, six hundred thirty-nine thousand, four hundred seventeen".