2161695890880 has 84 divisors (see below), whose sum is σ = 7435333167912. Its totient is φ = 576452236800.

The previous prime is 2161695890863. The next prime is 2161695890881. The reversal of 2161695890880 is 880985961612.

2161695890880 is a `hidden beast` number, since 2 + 1 + 616 + 9 + 5 + 8 + 9 + 0 + 8 + 8 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161695890881) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 375291546 + ... + 375297305.

Almost surely, 2^{2161695890880} is an apocalyptic number.

2161695890880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2161695890880 is an abundant number, since it is smaller than the sum of its proper divisors (5273637277032).

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

2161695890880 is a wasteful number, since it uses less digits than its factorization.

2161695890880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750588874 (or 750588861 counting only the distinct ones).

The product of its (nonzero) digits is 14929920, while the sum is 63.

The spelling of 2161695890880 in words is "two trillion, one hundred sixty-one billion, six hundred ninety-five million, eight hundred ninety thousand, eight hundred eighty".