161920078680 has 64 divisors (see below), whose sum is σ = 487845128160. Its totient is φ = 42993363968.

The previous prime is 161920078669. The next prime is 161920078699. The reversal of 161920078680 is 86870029161.

It is a super-2 number, since 2×161920078680² (a number of 23 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 (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2867607 + ... + 2923526.

Almost surely, 2^161920078680 is an apocalyptic number.

161920078680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161920078680 is an abundant number, since it is smaller than the sum of its proper divisors (325925049480).

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

161920078680 is a wasteful number, since it uses less digits than its factorization.

161920078680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5791380 (or 5791376 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 48.

The spelling of 161920078680 in words is "one hundred sixty-one billion, nine hundred twenty million, seventy-eight thousand, six hundred eighty".