161643544 has 16 divisors (see below), whose sum is σ = 305118000. Its totient is φ = 80278752.

The previous prime is 161643527. The next prime is 161643571. The reversal of 161643544 is 445346161.

It is a super-2 number, since 2×161643544² = 52257270633759872, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66612 + ... + 68995.

It is an arithmetic number, because the mean of its divisors is an integer number (19069875).

Almost surely, 2^161643544 is an apocalyptic number.

It is an amenable number.

161643544 is a deficient number, since it is larger than the sum of its proper divisors (143474456).

161643544 is a wasteful number, since it uses less digits than its factorization.

161643544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135762 (or 135758 counting only the distinct ones).

The product of its digits is 34560, while the sum is 34.

The square root of 161643544 is about 12713.9114359036. The cubic root of 161643544 is about 544.7360548919.

The spelling of 161643544 in words is "one hundred sixty-one million, six hundred forty-three thousand, five hundred forty-four".