161658368 has 20 divisors (see below), whose sum is σ = 323002020. Its totient is φ = 80828928.

The previous prime is 161658359. The next prime is 161658377. The reversal of 161658368 is 863856161.

It is an interprime number because it is at equal distance from previous prime (161658359) and next prime (161658377).

It is a super-2 number, since 2×161658368² = 52266855888846848, 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 as a sum of consecutive naturals, namely, 157358 + ... + 158381.

It is an arithmetic number, because the mean of its divisors is an integer number (16150101).

Almost surely, 2^161658368 is an apocalyptic number.

It is an amenable number.

161658368 is a deficient number, since it is larger than the sum of its proper divisors (161343652).

161658368 is an frugal number, since it uses more digits than its factorization.

161658368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315757 (or 315741 counting only the distinct ones).

The product of its digits is 207360, while the sum is 44.

The square root of 161658368 is about 12714.4944059919. The cubic root of 161658368 is about 544.7527065940.

The spelling of 161658368 in words is "one hundred sixty-one million, six hundred fifty-eight thousand, three hundred sixty-eight".