1311256433465 has 64 divisors (see below), whose sum is σ = 1797176678400. Its totient is φ = 909683712000.

The previous prime is 1311256433453. The next prime is 1311256433497. The reversal of 1311256433465 is 5643346521131.

It is a happy number.

It is not a de Polignac number, because 1311256433465 - 2⁶ = 1311256433401 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 77156009 + ... + 77173001.

It is an arithmetic number, because the mean of its divisors is an integer number (28080885600).

Almost surely, 2^{1311256433465} is an apocalyptic number.

It is an amenable number.

1311256433465 is a deficient number, since it is larger than the sum of its proper divisors (485920244935).

1311256433465 is a wasteful number, since it uses less digits than its factorization.

1311256433465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17618.

The product of its digits is 777600, while the sum is 44.

The spelling of 1311256433465 in words is "one trillion, three hundred eleven billion, two hundred fifty-six million, four hundred thirty-three thousand, four hundred sixty-five".