1216400263464 has 32 divisors (see below), whose sum is σ = 3045401569440. Its totient is φ = 404879966400.

The previous prime is 1216400263453. The next prime is 1216400263501. The reversal of 1216400263464 is 4643620046121.

It is a super-2 number, since 2×1216400263464² (a number of 25 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, 36657327 + ... + 36690494.

It is an arithmetic number, because the mean of its divisors is an integer number (95168799045).

Almost surely, 2^{1216400263464} is an apocalyptic number.

It is an amenable number.

1216400263464 is an abundant number, since it is smaller than the sum of its proper divisors (1829001305976).

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

1216400263464 is a wasteful number, since it uses less digits than its factorization.

1216400263464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73348521 (or 73348517 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 39.

The spelling of 1216400263464 in words is "one trillion, two hundred sixteen billion, four hundred million, two hundred sixty-three thousand, four hundred sixty-four".