1215662564400 has 120 divisors (see below), whose sum is σ = 3894484774224. Its totient is φ = 324150681600.

The previous prime is 1215662564381. The next prime is 1215662564453. The reversal of 1215662564400 is 44652665121.

It is a tau number, because it is divible by the number of its divisors (120).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18419460 + ... + 18485340.

Almost surely, 2^{1215662564400} is an apocalyptic number.

1215662564400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215662564400 is an abundant number, since it is smaller than the sum of its proper divisors (2678822209824).

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

1215662564400 is a wasteful number, since it uses less digits than its factorization.

1215662564400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81279 (or 81268 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 42.

The spelling of 1215662564400 in words is "one trillion, two hundred fifteen billion, six hundred sixty-two million, five hundred sixty-four thousand, four hundred".