166677755579 has 4 divisors (see below), whose sum is σ = 166728282600. Its totient is φ = 166627228560.

The previous prime is 166677755533. The next prime is 166677755591. The reversal of 166677755579 is 975557776661.

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

It is a cyclic number.

It is not a de Polignac number, because 166677755579 - 2¹² = 166677751483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166677755509) 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, 25258562 + ... + 25265159.

It is an arithmetic number, because the mean of its divisors is an integer number (41682070650).

Almost surely, 2^166677755579 is an apocalyptic number.

166677755579 is a deficient number, since it is larger than the sum of its proper divisors (50527021).

166677755579 is an equidigital number, since it uses as much as digits as its factorization.

166677755579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50527020.

The product of its digits is 583443000, while the sum is 71.

The spelling of 166677755579 in words is "one hundred sixty-six billion, six hundred seventy-seven million, seven hundred fifty-five thousand, five hundred seventy-nine".