216953181508 has 24 divisors (see below), whose sum is σ = 434010975552. Its totient is φ = 92957517984.

The previous prime is 216953181479. The next prime is 216953181527. The reversal of 216953181508 is 805181359612.

It is an unprimeable number.

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, 815566 + ... + 1048357.

It is an arithmetic number, because the mean of its divisors is an integer number (18083790648).

Almost surely, 2^216953181508 is an apocalyptic number.

216953181508 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

216953181508 is an abundant number, since it is smaller than the sum of its proper divisors (217057794044).

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

216953181508 is a wasteful number, since it uses less digits than its factorization.

216953181508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1868091 (or 1868089 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 49.

The spelling of 216953181508 in words is "two hundred sixteen billion, nine hundred fifty-three million, one hundred eighty-one thousand, five hundred eight".