64465321206561 has 48 divisors (see below), whose sum is σ = 102164055259392. Its totient is φ = 35989286755840.

The previous prime is 64465321206529. The next prime is 64465321206563. The reversal of 64465321206561 is 16560212356446.

It is not a de Polignac number, because 64465321206561 - 2⁵ = 64465321206529 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (64465321206563) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 110842890 + ... + 111422963.

It is an arithmetic number, because the mean of its divisors is an integer number (2128417817904).

Almost surely, 2^{64465321206561} is an apocalyptic number.

It is an amenable number.

64465321206561 is a deficient number, since it is larger than the sum of its proper divisors (37698734052831).

64465321206561 is a wasteful number, since it uses less digits than its factorization.

64465321206561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222265942 (or 222265931 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 51.

The spelling of 64465321206561 in words is "sixty-four trillion, four hundred sixty-five billion, three hundred twenty-one million, two hundred six thousand, five hundred sixty-one".