166253777915 has 16 divisors (see below), whose sum is σ = 211324759488. Its totient is φ = 125129143296.

The previous prime is 166253777891. The next prime is 166253777927. The reversal of 166253777915 is 519777352661.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 166253777915 - 2¹⁶ = 166253712379 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 177962 + ... + 603471.

It is an arithmetic number, because the mean of its divisors is an integer number (13207797468).

Almost surely, 2^166253777915 is an apocalyptic number.

166253777915 is a deficient number, since it is larger than the sum of its proper divisors (45070981573).

166253777915 is a wasteful number, since it uses less digits than its factorization.

166253777915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783958.

The product of its digits is 16669800, while the sum is 59.

The spelling of 166253777915 in words is "one hundred sixty-six billion, two hundred fifty-three million, seven hundred seventy-seven thousand, nine hundred fifteen".