218190512392 has 8 divisors (see below), whose sum is σ = 409107210750. Its totient is φ = 109095256192.

The previous prime is 218190512347. The next prime is 218190512429. The reversal of 218190512392 is 293215091812.

It can be written as a sum of positive squares in only one way, i.e., 216498506436 + 1692005956 = 465294^2 + 41134^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13636907017 + ... + 13636907032.

Almost surely, 2^218190512392 is an apocalyptic number.

It is an amenable number.

218190512392 is a deficient number, since it is larger than the sum of its proper divisors (190916698358).

218190512392 is a wasteful number, since it uses less digits than its factorization.

218190512392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27273814055 (or 27273814051 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 43.

The spelling of 218190512392 in words is "two hundred eighteen billion, one hundred ninety million, five hundred twelve thousand, three hundred ninety-two".