1172256625561 has 32 divisors (see below), whose sum is σ = 1365385269248. Its totient is φ = 985762353600.

The previous prime is 1172256625559. The next prime is 1172256625571. The reversal of 1172256625561 is 1655266522711.

It is a cyclic number.

It is not a de Polignac number, because 1172256625561 - 2¹ = 1172256625559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1172256625531) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40594450 + ... + 40623316.

It is an arithmetic number, because the mean of its divisors is an integer number (42668289664).

Almost surely, 2^{1172256625561} is an apocalyptic number.

It is an amenable number.

1172256625561 is a deficient number, since it is larger than the sum of its proper divisors (193128643687).

1172256625561 is a wasteful number, since it uses less digits than its factorization.

1172256625561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29501.

The product of its digits is 1512000, while the sum is 49.

The spelling of 1172256625561 in words is "one trillion, one hundred seventy-two billion, two hundred fifty-six million, six hundred twenty-five thousand, five hundred sixty-one".