161366004 has 18 divisors (see below), whose sum is σ = 407897490. Its totient is φ = 53788656.

The previous prime is 161365979. The next prime is 161366021. The reversal of 161366004 is 400663161.

It can be written as a sum of positive squares in only one way, i.e., 124277904 + 37088100 = 11148^2 + 6090^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2241159 + ... + 2241230.

Almost surely, 2^161366004 is an apocalyptic number.

It is an amenable number.

161366004 is an abundant number, since it is smaller than the sum of its proper divisors (246531486).

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

161366004 is a wasteful number, since it uses less digits than its factorization.

161366004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4482399 (or 4482394 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 161366004 is about 12702.9919310373. The cubic root of 161366004 is about 544.4241078926.

The spelling of 161366004 in words is "one hundred sixty-one million, three hundred sixty-six thousand, four".