216939379530 has 16 divisors (see below), whose sum is σ = 520654510944. Its totient is φ = 57850501200.

The previous prime is 216939379523. The next prime is 216939379603. The reversal of 216939379530 is 35973939612.

It is a super-2 number, since 2×216939379530² (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 7 ways as a sum of consecutive naturals, for example, 3615656296 + ... + 3615656355.

It is an arithmetic number, because the mean of its divisors is an integer number (32540906934).

Almost surely, 2^216939379530 is an apocalyptic number.

216939379530 is an abundant number, since it is smaller than the sum of its proper divisors (303715131414).

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

216939379530 is a wasteful number, since it uses less digits than its factorization.

216939379530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7231312661.

The product of its (nonzero) digits is 8266860, while the sum is 57.

The spelling of 216939379530 in words is "two hundred sixteen billion, nine hundred thirty-nine million, three hundred seventy-nine thousand, five hundred thirty".