170668139979 has 4 divisors (see below), whose sum is σ = 227557519976. Its totient is φ = 113778759984.

The previous prime is 170668139969. The next prime is 170668140011. The reversal of 170668139979 is 979931866071.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 170668139979 - 2⁴ = 170668139963 is a prime.

It is a super-2 number, since 2×170668139979² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (170668139909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28444689994 + ... + 28444689999.

It is an arithmetic number, because the mean of its divisors is an integer number (56889379994).

Almost surely, 2^170668139979 is an apocalyptic number.

170668139979 is a deficient number, since it is larger than the sum of its proper divisors (56889379997).

170668139979 is an equidigital number, since it uses as much as digits as its factorization.

170668139979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56889379996.

The product of its (nonzero) digits is 30862944, while the sum is 66.

The spelling of 170668139979 in words is "one hundred seventy billion, six hundred sixty-eight million, one hundred thirty-nine thousand, nine hundred seventy-nine".