166626387775 has 6 divisors (see below), whose sum is σ = 206616720872. Its totient is φ = 133301110200.

The previous prime is 166626387769. The next prime is 166626387779. The reversal of 166626387775 is 577783626661.

It is not a de Polignac number, because 166626387775 - 2¹⁹ = 166625863487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166626387779) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3332527731 + ... + 3332527780.

Almost surely, 2^166626387775 is an apocalyptic number.

166626387775 is a deficient number, since it is larger than the sum of its proper divisors (39990333097).

166626387775 is an equidigital number, since it uses as much as digits as its factorization.

166626387775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6665055521 (or 6665055516 counting only the distinct ones).

The product of its digits is 106686720, while the sum is 64.

The spelling of 166626387775 in words is "one hundred sixty-six billion, six hundred twenty-six million, three hundred eighty-seven thousand, seven hundred seventy-five".