397517650640 has 60 divisors (see below), whose sum is σ = 1015887591012. Its totient is φ = 144551869440.

The previous prime is 397517650639. The next prime is 397517650657. The reversal of 397517650640 is 46056715793.

It can be written as a sum of positive squares in 2 ways, for example, as 185251046464 + 212266604176 = 430408^2 + 460724^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20523257 + ... + 20542616.

Almost surely, 2^397517650640 is an apocalyptic number.

It is an amenable number.

397517650640 is an abundant number, since it is smaller than the sum of its proper divisors (618369940372).

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

397517650640 is a wasteful number, since it uses less digits than its factorization.

397517650640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41065908 (or 41065891 counting only the distinct ones).

The product of its (nonzero) digits is 4762800, while the sum is 53.

The spelling of 397517650640 in words is "three hundred ninety-seven billion, five hundred seventeen million, six hundred fifty thousand, six hundred forty".