161378656 has 24 divisors (see below), whose sum is σ = 325105704. Its totient is φ = 78812160.

The previous prime is 161378621. The next prime is 161378663. The reversal of 161378656 is 656873161.

It is a super-2 number, since 2×161378656² = 52086141224732672, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57265 + ... + 60016.

It is an arithmetic number, because the mean of its divisors is an integer number (13546071).

Almost surely, 2^161378656 is an apocalyptic number.

161378656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161378656 is an abundant number, since it is smaller than the sum of its proper divisors (163727048).

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

161378656 is a wasteful number, since it uses less digits than its factorization.

161378656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117334 (or 117326 counting only the distinct ones).

The product of its digits is 181440, while the sum is 43.

The square root of 161378656 is about 12703.4899141929. The cubic root of 161378656 is about 544.4383361556.

The spelling of 161378656 in words is "one hundred sixty-one million, three hundred seventy-eight thousand, six hundred fifty-six".