161420208656 has 20 divisors (see below), whose sum is σ = 357430462272. Its totient is φ = 69180089376.

The previous prime is 161420208641. The next prime is 161420208671. The reversal of 161420208656 is 656802024161.

It is an interprime number because it is at equal distance from previous prime (161420208641) and next prime (161420208671).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 720625820 + ... + 720626043.

Almost surely, 2^161420208656 is an apocalyptic number.

161420208656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161420208656 is an abundant number, since it is smaller than the sum of its proper divisors (196010253616).

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

161420208656 is a wasteful number, since it uses less digits than its factorization.

161420208656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1441251878 (or 1441251872 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 41.

The spelling of 161420208656 in words is "one hundred sixty-one billion, four hundred twenty million, two hundred eight thousand, six hundred fifty-six".