64220625521 has 8 divisors (see below), whose sum is σ = 69182555904. Its totient is φ = 59261821200.

The previous prime is 64220625503. The next prime is 64220625527. The reversal of 64220625521 is 12552602246.

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 64220625521 - 2⁶ = 64220625457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64220625527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 738755 + ... + 821096.

It is an arithmetic number, because the mean of its divisors is an integer number (8647819488).

Almost surely, 2^64220625521 is an apocalyptic number.

It is an amenable number.

64220625521 is a deficient number, since it is larger than the sum of its proper divisors (4961930383).

64220625521 is a wasteful number, since it uses less digits than its factorization.

64220625521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1563031.

The product of its (nonzero) digits is 57600, while the sum is 35.

The spelling of 64220625521 in words is "sixty-four billion, two hundred twenty million, six hundred twenty-five thousand, five hundred twenty-one".