161585456 has 20 divisors (see below), whose sum is σ = 316174704. Its totient is φ = 79992000.

The previous prime is 161585453. The next prime is 161585467. The reversal of 161585456 is 654585161.

It is a super-2 number, since 2×161585456² = 52219719181455872, which contains 22 as substring.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (161585453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48380 + ... + 51611.

Almost surely, 2^161585456 is an apocalyptic number.

161585456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161585456 is a deficient number, since it is larger than the sum of its proper divisors (154589248).

161585456 is a wasteful number, since it uses less digits than its factorization.

161585456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100100 (or 100094 counting only the distinct ones).

The product of its digits is 144000, while the sum is 41.

The square root of 161585456 is about 12711.6268038359. The cubic root of 161585456 is about 544.6707952094.

The spelling of 161585456 in words is "one hundred sixty-one million, five hundred eighty-five thousand, four hundred fifty-six".