64564976851601 has 4 divisors (see below), whose sum is σ = 64566149514804. Its totient is φ = 64563804188400.

The previous prime is 64564976851561. The next prime is 64564976851607. The reversal of 64564976851601 is 10615867946546.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34921906594576 + 29643070257025 = 5909476^2 + 5444545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64564976851601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64564976851607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 586249010 + ... + 586359131.

It is an arithmetic number, because the mean of its divisors is an integer number (16141537378701).

Almost surely, 2^{64564976851601} is an apocalyptic number.

It is an amenable number.

64564976851601 is a deficient number, since it is larger than the sum of its proper divisors (1172663203).

64564976851601 is a wasteful number, since it uses less digits than its factorization.

64564976851601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1172663202.

The product of its (nonzero) digits is 261273600, while the sum is 68.

The spelling of 64564976851601 in words is "sixty-four trillion, five hundred sixty-four billion, nine hundred seventy-six million, eight hundred fifty-one thousand, six hundred one".