64220172564 has 24 divisors (see below), whose sum is σ = 149870804608. Its totient is φ = 21403333440.

The previous prime is 64220172521. The next prime is 64220172629. The reversal of 64220172564 is 46527102246.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 344332 + ... + 496995.

Almost surely, 2^64220172564 is an apocalyptic number.

It is an amenable number.

64220172564 is an abundant number, since it is smaller than the sum of its proper divisors (85650632044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64220172564 is a wasteful number, since it uses less digits than its factorization.

64220172564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847695 (or 847693 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 39.

The spelling of 64220172564 in words is "sixty-four billion, two hundred twenty million, one hundred seventy-two thousand, five hundred sixty-four".