161658375 has 32 divisors (see below), whose sum is σ = 280710144. Its totient is φ = 82464800.

The previous prime is 161658359. The next prime is 161658377. The reversal of 161658375 is 573856161.

It is not a de Polignac number, because 161658375 - 2⁴ = 161658359 is a prime.

It is a super-2 number, since 2×161658375² = 52266860415281250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161658377) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 747 + ... + 17996.

It is an arithmetic number, because the mean of its divisors is an integer number (8772192).

Almost surely, 2^161658375 is an apocalyptic number.

161658375 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161658375 is a deficient number, since it is larger than the sum of its proper divisors (119051769).

161658375 is a wasteful number, since it uses less digits than its factorization.

161658375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18784 (or 18774 counting only the distinct ones).

The product of its digits is 151200, while the sum is 42.

The square root of 161658375 is about 12714.4946812683. The cubic root of 161658375 is about 544.7527144569.

The spelling of 161658375 in words is "one hundred sixty-one million, six hundred fifty-eight thousand, three hundred seventy-five".