166057536421 has 8 divisors (see below), whose sum is σ = 189869873984. Its totient is φ = 142267656960.

The previous prime is 166057536371. The next prime is 166057536457. The reversal of 166057536421 is 124635750661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166057536421 - 2³¹ = 163910052773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166057636421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5598675 + ... + 5628256.

It is an arithmetic number, because the mean of its divisors is an integer number (23733734248).

Almost surely, 2^166057536421 is an apocalyptic number.

It is an amenable number.

166057536421 is a deficient number, since it is larger than the sum of its proper divisors (23812337563).

166057536421 is a wasteful number, since it uses less digits than its factorization.

166057536421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11229051.

The product of its (nonzero) digits is 907200, while the sum is 46.

The spelling of 166057536421 in words is "one hundred sixty-six billion, fifty-seven million, five hundred thirty-six thousand, four hundred twenty-one".