161566002 has 40 divisors (see below), whose sum is σ = 389880876. Its totient is φ = 49711968.

The previous prime is 161566001. The next prime is 161566019. The reversal of 161566002 is 200665161.

It is a happy number.

161566002 is a `hidden beast` number, since 1 + 6 + 1 + 56 + 600 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 161264601 + 301401 = 12699^2 + 549^2 .

It is a super-2 number, since 2×161566002² = 52207146004528008, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (161566001) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 36253 + ... + 40464.

Almost surely, 2^161566002 is an apocalyptic number.

161566002 is an abundant number, since it is smaller than the sum of its proper divisors (228314874).

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

161566002 is a wasteful number, since it uses less digits than its factorization.

161566002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76744 (or 76735 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 161566002 is about 12710.8615758335. The cubic root of 161566002 is about 544.6489358764.

The spelling of 161566002 in words is "one hundred sixty-one million, five hundred sixty-six thousand, two".