1272205561216 has 64 divisors (see below), whose sum is σ = 2684147323680. Its totient is φ = 598553632768.

The previous prime is 1272205561169. The next prime is 1272205561229. The reversal of 1272205561216 is 6121655022721.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

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, 10237245 + ... + 10360771.

Almost surely, 2^{1272205561216} is an apocalyptic number.

1272205561216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1272205561216 is an abundant number, since it is smaller than the sum of its proper divisors (1411941762464).

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

1272205561216 is a wasteful number, since it uses less digits than its factorization.

1272205561216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128291 (or 128279 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 40.

The spelling of 1272205561216 in words is "one trillion, two hundred seventy-two billion, two hundred five million, five hundred sixty-one thousand, two hundred sixteen".