216251423460 has 60 divisors (see below), whose sum is σ = 678388729788. Its totient is φ = 57667045824.

The previous prime is 216251423447. The next prime is 216251423477. The reversal of 216251423460 is 64324152612.

216251423460 is a `hidden beast` number, since 2 + 1 + 62 + 514 + 23 + 4 + 60 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 121200067044 + 95051356416 = 348138^2 + 308304^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a super-3 number, since 3×216251423460³ (a number of 35 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 66742647 + ... + 66745886.

Almost surely, 2^216251423460 is an apocalyptic number.

216251423460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216251423460 is an abundant number, since it is smaller than the sum of its proper divisors (462137306328).

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

216251423460 is a wasteful number, since it uses less digits than its factorization.

216251423460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133488554 (or 133488543 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The spelling of 216251423460 in words is "two hundred sixteen billion, two hundred fifty-one million, four hundred twenty-three thousand, four hundred sixty".