64646812457 has 8 divisors (see below), whose sum is σ = 66798101760. Its totient is φ = 62499642480.

The previous prime is 64646812453. The next prime is 64646812469. The reversal of 64646812457 is 75421864646.

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 64646812457 - 2² = 64646812453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64646812399 and 64646812408.

It is not an unprimeable number, because it can be changed into a prime (64646812453) 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, 997907 + ... + 1060712.

It is an arithmetic number, because the mean of its divisors is an integer number (8349762720).

Almost surely, 2^64646812457 is an apocalyptic number.

It is an amenable number.

64646812457 is a deficient number, since it is larger than the sum of its proper divisors (2151289303).

64646812457 is a wasteful number, since it uses less digits than its factorization.

64646812457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2059663.

The product of its digits is 7741440, while the sum is 53.

The spelling of 64646812457 in words is "sixty-four billion, six hundred forty-six million, eight hundred twelve thousand, four hundred fifty-seven".