8161371640 has 32 divisors (see below), whose sum is σ = 18417606480. Its totient is φ = 3254856192.

The previous prime is 8161371637. The next prime is 8161371671. The reversal of 8161371640 is 461731618.

It is a self number, because there is not a number n which added to its sum of digits gives 8161371640.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 289242 + ... + 316201.

Almost surely, 2^8161371640 is an apocalyptic number.

It is an amenable number.

8161371640 is an abundant number, since it is smaller than the sum of its proper divisors (10256234840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8161371640 is a wasteful number, since it uses less digits than its factorization.

8161371640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605791 (or 605787 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 8161371640 is about 90340.3101610793. The cubic root of 8161371640 is about 2013.3582170465.

The spelling of 8161371640 in words is "eight billion, one hundred sixty-one million, three hundred seventy-one thousand, six hundred forty".