1311620561056 has 48 divisors (see below), whose sum is σ = 2840055692544. Its totient is φ = 592483256064.

The previous prime is 1311620561039. The next prime is 1311620561087. The reversal of 1311620561056 is 6501650261131.

It is a super-3 number, since 3×1311620561056³ (a number of 37 digits) contains 333 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, 33522300 + ... + 33561403.

It is an arithmetic number, because the mean of its divisors is an integer number (59167826928).

Almost surely, 2^{1311620561056} is an apocalyptic number.

1311620561056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1311620561056 is an abundant number, since it is smaller than the sum of its proper divisors (1528435131488).

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

1311620561056 is a wasteful number, since it uses less digits than its factorization.

1311620561056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67083773 (or 67083765 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 37.

The spelling of 1311620561056 in words is "one trillion, three hundred eleven billion, six hundred twenty million, five hundred sixty-one thousand, fifty-six".