166401435556944 has 60 divisors (see below), whose sum is σ = 532220464522656. Its totient is φ = 47543267301696.

The previous prime is 166401435556903. The next prime is 166401435556973. The reversal of 166401435556944 is 449655534104661.

166401435556944 is a `hidden beast` number, since 1 + 6 + 6 + 4 + 0 + 1 + 4 + 35 + 556 + 9 + 44 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82540393614 + ... + 82540395629.

Almost surely, 2^{166401435556944} is an apocalyptic number.

166401435556944 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

166401435556944 is an abundant number, since it is smaller than the sum of its proper divisors (365819028965712).

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

166401435556944 is a wasteful number, since it uses less digits than its factorization.

166401435556944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165080789264 (or 165080789255 counting only the distinct ones).

The product of its (nonzero) digits is 186624000, while the sum is 63.

The spelling of 166401435556944 in words is "one hundred sixty-six trillion, four hundred one billion, four hundred thirty-five million, five hundred fifty-six thousand, nine hundred forty-four".