161636450 has 12 divisors (see below), whose sum is σ = 300643890. Its totient is φ = 64654560.

The previous prime is 161636413. The next prime is 161636467. The reversal of 161636450 is 54636161.

It can be written as a sum of positive squares in 3 ways, for example, as 114425809 + 47210641 = 10697^2 + 6871^2 .

It is a super-2 number, since 2×161636450² = 52252683937205000, which contains 22 as substring.

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, 1616315 + ... + 1616414.

Almost surely, 2^161636450 is an apocalyptic number.

161636450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161636450 is a deficient number, since it is larger than the sum of its proper divisors (139007440).

161636450 is a wasteful number, since it uses less digits than its factorization.

161636450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3232741 (or 3232736 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 161636450 is about 12713.6324471018. The cubic root of 161636450 is about 544.7280858880.

The spelling of 161636450 in words is "one hundred sixty-one million, six hundred thirty-six thousand, four hundred fifty".