161656250 has 56 divisors (see below), whose sum is σ = 346870560. Its totient is φ = 55350000.

The previous prime is 161656207. The next prime is 161656267. The reversal of 161656250 is 52656161.

It is a super-2 number, since 2×161656250² = 52265486328125000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 218381 + ... + 219119.

Almost surely, 2^161656250 is an apocalyptic number.

161656250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161656250 is an abundant number, since it is smaller than the sum of its proper divisors (185214310).

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

161656250 is an frugal number, since it uses more digits than its factorization.

161656250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778 (or 753 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 161656250 is about 12714.4111149514. The cubic root of 161656250 is about 544.7503275208.

The spelling of 161656250 in words is "one hundred sixty-one million, six hundred fifty-six thousand, two hundred fifty".