166561626662984 has 32 divisors (see below), whose sum is σ = 361944782294400. Its totient is φ = 70378152109440.

The previous prime is 166561626662933. The next prime is 166561626663031. The reversal of 166561626662984 is 489266626165661.

It is a Smith number, since the sum of its digits (74) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20945874629 + ... + 20945882580.

It is an arithmetic number, because the mean of its divisors is an integer number (11310774446700).

Almost surely, 2^{166561626662984} is an apocalyptic number.

166561626662984 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

166561626662984 is an abundant number, since it is smaller than the sum of its proper divisors (195383155631416).

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

166561626662984 is a wasteful number, since it uses less digits than its factorization.

166561626662984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41891757293 (or 41891757289 counting only the distinct ones).

The product of its digits is 1612431360, while the sum is 74.

The spelling of 166561626662984 in words is "one hundred sixty-six trillion, five hundred sixty-one billion, six hundred twenty-six million, six hundred sixty-two thousand, nine hundred eighty-four".