1156372398961 has 32 divisors (see below), whose sum is σ = 1316554767360. Its totient is φ = 1008011633664.

The previous prime is 1156372398859. The next prime is 1156372398983. The reversal of 1156372398961 is 1698932736511.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1156372398961 - 2⁹ = 1156372398449 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1156372398961.

It is not an unprimeable number, because it can be changed into a prime (1156372395961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27496596 + ... + 27538618.

It is an arithmetic number, because the mean of its divisors is an integer number (41142336480).

Almost surely, 2^{1156372398961} is an apocalyptic number.

It is an amenable number.

1156372398961 is a deficient number, since it is larger than the sum of its proper divisors (160182368399).

1156372398961 is a wasteful number, since it uses less digits than its factorization.

1156372398961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43665.

The product of its digits is 14696640, while the sum is 61.

The spelling of 1156372398961 in words is "one trillion, one hundred fifty-six billion, three hundred seventy-two million, three hundred ninety-eight thousand, nine hundred sixty-one".