161657496 has 192 divisors, whose sum is σ = 588107520. Its totient is φ = 38741760.

The previous prime is 161657413. The next prime is 161657549. The reversal of 161657496 is 694756161.

It is a super-2 number, since 2×161657496² = 52266292025980032, 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 in 47 ways as a sum of consecutive naturals, for example, 70951 + ... + 73193.

It is an arithmetic number, because the mean of its divisors is an integer number (3063060).

Almost surely, 2^161657496 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161657496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (294053760).

161657496 is an abundant number, since it is smaller than the sum of its proper divisors (426450024).

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

161657496 is a wasteful number, since it uses less digits than its factorization.

161657496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2286 (or 2279 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 161657496 is about 12714.4601143737. The cubic root of 161657496 is about 544.7517271103.

The spelling of 161657496 in words is "one hundred sixty-one million, six hundred fifty-seven thousand, four hundred ninety-six".