648156857680 has 40 divisors (see below), whose sum is σ = 1539027781632. Its totient is φ = 253746513024.

The previous prime is 648156857653. The next prime is 648156857681. The reversal of 648156857680 is 86758651846.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×648156857680² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648156857681) by changing a digit.

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, 86187312 + ... + 86194831.

Almost surely, 2^648156857680 is an apocalyptic number.

It is an amenable number.

648156857680 is an abundant number, since it is smaller than the sum of its proper divisors (890870923952).

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

648156857680 is a wasteful number, since it uses less digits than its factorization.

648156857680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172382203 (or 172382197 counting only the distinct ones).

The product of its (nonzero) digits is 77414400, while the sum is 64.

The spelling of 648156857680 in words is "six hundred forty-eight billion, one hundred fifty-six million, eight hundred fifty-seven thousand, six hundred eighty".