165966531498 has 32 divisors (see below), whose sum is σ = 368853395520. Its totient is φ = 55316345040.

The previous prime is 165966531463. The next prime is 165966531551. The reversal of 165966531498 is 894135669561.

165966531498 is a `hidden beast` number, since 1 + 6 + 5 + 9 + 6 + 6 + 531 + 4 + 98 = 666.

It is a super-2 number, since 2×165966531498² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 371061 + ... + 685287.

It is an arithmetic number, because the mean of its divisors is an integer number (11526668610).

Almost surely, 2^165966531498 is an apocalyptic number.

165966531498 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

165966531498 is an abundant number, since it is smaller than the sum of its proper divisors (202886864022).

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

165966531498 is a wasteful number, since it uses less digits than its factorization.

165966531498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324019 (or 324013 counting only the distinct ones).

The product of its digits is 41990400, while the sum is 63.

The spelling of 165966531498 in words is "one hundred sixty-five billion, nine hundred sixty-six million, five hundred thirty-one thousand, four hundred ninety-eight".