166077901979 has 16 divisors (see below), whose sum is σ = 181760790240. Its totient is φ = 150492840960.

The previous prime is 166077901973. The next prime is 166077902021. The reversal of 166077901979 is 979109770661.

It is a happy number.

166077901979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 166077901979 - 2²⁴ = 166061124763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166077901973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12065369 + ... + 12079125.

It is an arithmetic number, because the mean of its divisors is an integer number (11360049390).

Almost surely, 2^166077901979 is an apocalyptic number.

166077901979 is a deficient number, since it is larger than the sum of its proper divisors (15682888261).

166077901979 is a wasteful number, since it uses less digits than its factorization.

166077901979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17230.

The product of its (nonzero) digits is 9001692, while the sum is 62.

The spelling of 166077901979 in words is "one hundred sixty-six billion, seventy-seven million, nine hundred one thousand, nine hundred seventy-nine".