11872657961 has 4 divisors (see below), whose sum is σ = 11873261652. Its totient is φ = 11872054272.

The previous prime is 11872657919. The next prime is 11872657963. The reversal of 11872657961 is 16975627811.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5308579600 + 6564078361 = 72860^2 + 81019^2 .

It is a cyclic number.

It is not a de Polignac number, because 11872657961 - 2¹⁰ = 11872656937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11872657963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271316 + ... + 312021.

It is an arithmetic number, because the mean of its divisors is an integer number (2968315413).

Almost surely, 2^11872657961 is an apocalyptic number.

It is an amenable number.

11872657961 is a deficient number, since it is larger than the sum of its proper divisors (603691).

11872657961 is an equidigital number, since it uses as much as digits as its factorization.

11872657961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603690.

The product of its digits is 1270080, while the sum is 53.

The spelling of 11872657961 in words is "eleven billion, eight hundred seventy-two million, six hundred fifty-seven thousand, nine hundred sixty-one".