161658520 has 32 divisors (see below), whose sum is σ = 364240800. Its totient is φ = 64572928.

The previous prime is 161658463. The next prime is 161658547. The reversal of 161658520 is 25856161.

It is a happy number.

161658520 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161658520² = 52266954177180800, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 31152 + ... + 35968.

It is an arithmetic number, because the mean of its divisors is an integer number (11382525).

Almost surely, 2^161658520 is an apocalyptic number.

161658520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161658520 is an abundant number, since it is smaller than the sum of its proper divisors (202582280).

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

161658520 is a wasteful number, since it uses less digits than its factorization.

161658520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5667 (or 5663 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 161658520 is about 12714.5003834205. The cubic root of 161658520 is about 544.7528773294.

The spelling of 161658520 in words is "one hundred sixty-one million, six hundred fifty-eight thousand, five hundred twenty".