216398653128 has 48 divisors (see below), whose sum is σ = 669805356480. Its totient is φ = 61828186464.

The previous prime is 216398653111. The next prime is 216398653147. The reversal of 216398653128 is 821356893612.

216398653128 is a `hidden beast` number, since 2 + 1 + 6 + 3 + 9 + 86 + 531 + 28 = 666.

It is a super-2 number, since 2×216398653128² (a number of 23 digits) contains 22 as substring.

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, 214680700 + ... + 214681707.

It is an arithmetic number, because the mean of its divisors is an integer number (13954278260).

Almost surely, 2^216398653128 is an apocalyptic number.

216398653128 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

216398653128 is an abundant number, since it is smaller than the sum of its proper divisors (453406703352).

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

216398653128 is a wasteful number, since it uses less digits than its factorization.

216398653128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429362426 (or 429362419 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 54.

The spelling of 216398653128 in words is "two hundred sixteen billion, three hundred ninety-eight million, six hundred fifty-three thousand, one hundred twenty-eight".