165643552536 has 96 divisors (see below), whose sum is σ = 525511126080. Its totient is φ = 43024296000.

The previous prime is 165643552523. The next prime is 165643552541. The reversal of 165643552536 is 635255346561.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6389490 + ... + 6415361.

It is an arithmetic number, because the mean of its divisors is an integer number (5474074230).

Almost surely, 2^165643552536 is an apocalyptic number.

It is an amenable number.

165643552536 is an abundant number, since it is smaller than the sum of its proper divisors (359867573544).

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

165643552536 is a wasteful number, since it uses less digits than its factorization.

165643552536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12804885 (or 12804874 counting only the distinct ones).

The product of its digits is 9720000, while the sum is 51.

The spelling of 165643552536 in words is "one hundred sixty-five billion, six hundred forty-three million, five hundred fifty-two thousand, five hundred thirty-six".