166051661561504 has 48 divisors (see below), whose sum is σ = 346747091755680. Its totient is φ = 78055622311680.

The previous prime is 166051661561503. The next prime is 166051661561521. The reversal of 166051661561504 is 405165166150661.

It is not an unprimeable number, because it can be changed into a prime (166051661561503) by changing a digit.

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, 1042329839 + ... + 1042489134.

It is an arithmetic number, because the mean of its divisors is an integer number (7223897744910).

Almost surely, 2^{166051661561504} is an apocalyptic number.

It is an amenable number.

166051661561504 is an abundant number, since it is smaller than the sum of its proper divisors (180695430194176).

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

166051661561504 is a wasteful number, since it uses less digits than its factorization.

166051661561504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2084819133 (or 2084819125 counting only the distinct ones).

The product of its (nonzero) digits is 3888000, while the sum is 53.

The spelling of 166051661561504 in words is "one hundred sixty-six trillion, fifty-one billion, six hundred sixty-one million, five hundred sixty-one thousand, five hundred four".