161870776656 has 20 divisors (see below), whose sum is σ = 418166173152. Its totient is φ = 53956925536.

The previous prime is 161870776601. The next prime is 161870776693. The reversal of 161870776656 is 656677078161.

It is a self number, because there is not a number n which added to its sum of digits gives 161870776656.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1686153876 + ... + 1686153971.

Almost surely, 2^161870776656 is an apocalyptic number.

161870776656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161870776656 is an abundant number, since it is smaller than the sum of its proper divisors (256295396496).

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

161870776656 is a wasteful number, since it uses less digits than its factorization.

161870776656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3372307858 (or 3372307852 counting only the distinct ones).

The product of its (nonzero) digits is 17781120, while the sum is 60.

The spelling of 161870776656 in words is "one hundred sixty-one billion, eight hundred seventy million, seven hundred seventy-six thousand, six hundred fifty-six".