9661372131886 has 32 divisors (see below), whose sum is σ = 15599213908992. Its totient is φ = 4471290426240.

The previous prime is 9661372131877. The next prime is 9661372131989. The reversal of 9661372131886 is 6881312731669.

It is a happy number.

It is a super-2 number, since 2×9661372131886² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2110800 + ... + 4876291.

It is an arithmetic number, because the mean of its divisors is an integer number (487475434656).

Almost surely, 2^{9661372131886} is an apocalyptic number.

9661372131886 is a deficient number, since it is larger than the sum of its proper divisors (5937841777106).

9661372131886 is a wasteful number, since it uses less digits than its factorization.

9661372131886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6987784.

The product of its digits is 15676416, while the sum is 61.

The spelling of 9661372131886 in words is "nine trillion, six hundred sixty-one billion, three hundred seventy-two million, one hundred thirty-one thousand, eight hundred eighty-six".