165971528816 has 20 divisors (see below), whose sum is σ = 321577557600. Its totient is φ = 82983772032.

The previous prime is 165971528771. The next prime is 165971528861. The reversal of 165971528816 is 618825179561.

It is an interprime number because it is at equal distance from previous prime (165971528771) and next prime (165971528861).

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, 747980 + ... + 944148.

It is an arithmetic number, because the mean of its divisors is an integer number (16078877880).

Almost surely, 2^165971528816 is an apocalyptic number.

165971528816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

165971528816 is a deficient number, since it is larger than the sum of its proper divisors (155606028784).

165971528816 is a wasteful number, since it uses less digits than its factorization.

165971528816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249056 (or 249050 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 59.

The spelling of 165971528816 in words is "one hundred sixty-five billion, nine hundred seventy-one million, five hundred twenty-eight thousand, eight hundred sixteen".