8161380669931 has 32 divisors (see below), whose sum is σ = 8826894362880. Its totient is φ = 7522019107200.

The previous prime is 8161380669917. The next prime is 8161380669971. The reversal of 8161380669931 is 1399660831618.

It is a cyclic number.

It is not a de Polignac number, because 8161380669931 - 2³¹ = 8159233186283 is a prime.

It is a super-2 number, since 2×8161380669931² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8161380669931.

It is not an unprimeable number, because it can be changed into a prime (8161380669971) 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, 169225401 + ... + 169273621.

It is an arithmetic number, because the mean of its divisors is an integer number (275840448840).

Almost surely, 2^{8161380669931} is an apocalyptic number.

8161380669931 is a deficient number, since it is larger than the sum of its proper divisors (665513692949).

8161380669931 is a wasteful number, since it uses less digits than its factorization.

8161380669931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49707.

The product of its (nonzero) digits is 10077696, while the sum is 61.

The spelling of 8161380669931 in words is "eight trillion, one hundred sixty-one billion, three hundred eighty million, six hundred sixty-nine thousand, nine hundred thirty-one".