161566351 has 8 divisors (see below), whose sum is σ = 175049424. Its totient is φ = 148525440.

The previous prime is 161566343. The next prime is 161566373. The reversal of 161566351 is 153665161.

161566351 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161566351 - 2³ = 161566343 is a prime.

It is a super-2 number, since 2×161566351² = 52207371550910402, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161566331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109780 + ... + 111241.

It is an arithmetic number, because the mean of its divisors is an integer number (21881178).

Almost surely, 2^161566351 is an apocalyptic number.

161566351 is a deficient number, since it is larger than the sum of its proper divisors (13483073).

161566351 is a wasteful number, since it uses less digits than its factorization.

161566351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221081.

The product of its digits is 16200, while the sum is 34.

The square root of 161566351 is about 12710.8753042424. The cubic root of 161566351 is about 544.6493280429.

The spelling of 161566351 in words is "one hundred sixty-one million, five hundred sixty-six thousand, three hundred fifty-one".