161630646 has 8 divisors (see below), whose sum is σ = 323261304. Its totient is φ = 53876880.

The previous prime is 161630629. The next prime is 161630671. The reversal of 161630646 is 646036161.

It is a sphenic number, since it is the product of 3 distinct primes.

161630646 is an admirable number.

It is a super-2 number, since 2×161630646² = 52248931452754632, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13469215 + ... + 13469226.

It is an arithmetic number, because the mean of its divisors is an integer number (40407663).

Almost surely, 2^161630646 is an apocalyptic number.

161630646 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

161630646 is a wasteful number, since it uses less digits than its factorization.

161630646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26938446.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 161630646 is about 12713.4041861336. The cubic root of 161630646 is about 544.7215658247.

The spelling of 161630646 in words is "one hundred sixty-one million, six hundred thirty thousand, six hundred forty-six".