161520158 has 16 divisors (see below), whose sum is σ = 245696976. Its totient is φ = 79625280.

The previous prime is 161520157. The next prime is 161520173. The reversal of 161520158 is 851025161.

It is a super-2 number, since 2×161520158² = 52177522880689928, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 161520158.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161520157) 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, 157688 + ... + 158708.

It is an arithmetic number, because the mean of its divisors is an integer number (15356061).

Almost surely, 2^161520158 is an apocalyptic number.

161520158 is a deficient number, since it is larger than the sum of its proper divisors (84176818).

161520158 is a wasteful number, since it uses less digits than its factorization.

161520158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2059.

The product of its (nonzero) digits is 2400, while the sum is 29.

The square root of 161520158 is about 12709.0581082943. The cubic root of 161520158 is about 544.5974166881.

The spelling of 161520158 in words is "one hundred sixty-one million, five hundred twenty thousand, one hundred fifty-eight".