166999979742402 has 16 divisors (see below), whose sum is σ = 334004743572192. Its totient is φ = 55665862566240.

The previous prime is 166999979742383. The next prime is 166999979742433. The reversal of 166999979742402 is 204247979999661.

166999979742402 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198883099 + ... + 199721022.

It is an arithmetic number, because the mean of its divisors is an integer number (20875296473262).

Almost surely, 2^{166999979742402} is an apocalyptic number.

166999979742402 is an abundant number, since it is smaller than the sum of its proper divisors (167004763829790).

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

166999979742402 is a wasteful number, since it uses less digits than its factorization.

166999979742402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398673953.

The product of its (nonzero) digits is 6666395904, while the sum is 84.

The spelling of 166999979742402 in words is "one hundred sixty-six trillion, nine hundred ninety-nine billion, nine hundred seventy-nine million, seven hundred forty-two thousand, four hundred two".