11661631951 has 2 divisors, whose sum is σ = 11661631952. Its totient is φ = 11661631950.

The previous prime is 11661631939. The next prime is 11661632011. The reversal of 11661631951 is 15913616611.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11661631951 - 2²⁵ = 11628077519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11661631901) 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 as a sum of consecutive naturals, namely, 5830815975 + 5830815976.

It is an arithmetic number, because the mean of its divisors is an integer number (5830815976).

Almost surely, 2^11661631951 is an apocalyptic number.

11661631951 is a deficient number, since it is larger than the sum of its proper divisors (1).

11661631951 is an equidigital number, since it uses as much as digits as its factorization.

11661631951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160, while the sum is 40.

The spelling of 11661631951 in words is "eleven billion, six hundred sixty-one million, six hundred thirty-one thousand, nine hundred fifty-one".