161599680 has 168 divisors, whose sum is σ = 606484944. Its totient is φ = 39168000.

The previous prime is 161599649. The next prime is 161599699. The reversal of 161599680 is 86995161.

It is a super-2 number, since 2×161599680² = 52228913152204800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29130 + ... + 34230.

Almost surely, 2^161599680 is an apocalyptic number.

161599680 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 161599680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (303242472).

161599680 is an abundant number, since it is smaller than the sum of its proper divisors (444885264).

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

161599680 is a wasteful number, since it uses less digits than its factorization.

161599680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5135 (or 5122 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 161599680 is about 12712.1862793148. The cubic root of 161599680 is about 544.6867767841.

The spelling of 161599680 in words is "one hundred sixty-one million, five hundred ninety-nine thousand, six hundred eighty".