161697600 has 336 divisors, whose sum is σ = 623620800. Its totient is φ = 40642560.

The previous prime is 161697589. The next prime is 161697607. The reversal of 161697600 is 6796161.

It is a super-2 number, since 2×161697600² = 52292227691520000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161697607) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 820702 + ... + 820898.

Almost surely, 2^161697600 is an apocalyptic number.

161697600 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161697600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (311810400).

161697600 is an abundant number, since it is smaller than the sum of its proper divisors (461923200).

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

161697600 is a wasteful number, since it uses less digits than its factorization.

161697600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247 (or 226 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 161697600 is about 12716.0371185366. The cubic root of 161697600 is about 544.7967707313.

The spelling of 161697600 in words is "one hundred sixty-one million, six hundred ninety-seven thousand, six hundred".