166501501398 has 32 divisors (see below), whose sum is σ = 370056107520. Its totient is φ = 55492584840.

The previous prime is 166501501381. The next prime is 166501501429. The reversal of 166501501398 is 893105105661.

166501501398 is a `hidden beast` number, since 1 + 6 + 6 + 50 + 1 + 501 + 3 + 98 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168543 + ... + 601173.

It is an arithmetic number, because the mean of its divisors is an integer number (11564253360).

Almost surely, 2^166501501398 is an apocalyptic number.

166501501398 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

166501501398 is an abundant number, since it is smaller than the sum of its proper divisors (203554606122).

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

166501501398 is a wasteful number, since it uses less digits than its factorization.

166501501398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439769 (or 439763 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The spelling of 166501501398 in words is "one hundred sixty-six billion, five hundred one million, five hundred one thousand, three hundred ninety-eight".