640321421320625 has 40 divisors (see below), whose sum is σ = 880610818909536. Its totient is φ = 461567170400000.

The previous prime is 640321421320619. The next prime is 640321421320661. The reversal of 640321421320625 is 526023124123046.

It is not a de Polignac number, because 640321421320625 - 2²⁶ = 640321354211761 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 411336671 + ... + 412890420.

Almost surely, 2^{640321421320625} is an apocalyptic number.

It is an amenable number.

640321421320625 is a deficient number, since it is larger than the sum of its proper divisors (240289397588911).

640321421320625 is a wasteful number, since it uses less digits than its factorization.

640321421320625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824227235 (or 824227220 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 41.

The spelling of 640321421320625 in words is "six hundred forty trillion, three hundred twenty-one billion, four hundred twenty-one million, three hundred twenty thousand, six hundred twenty-five".