166454977 has 4 divisors (see below), whose sum is σ = 179259220. Its totient is φ = 153650736.

The previous prime is 166454947. The next prime is 166454987. The reversal of 166454977 is 779454661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 779454661 = 107 ⋅7284623.

It can be written as a sum of positive squares in 2 ways, for example, as 81649296 + 84805681 = 9036^2 + 9209^2 .

It is a cyclic number.

It is not a de Polignac number, because 166454977 - 2¹⁵ = 166422209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166454977.

It is not an unprimeable number, because it can be changed into a prime (166454947) 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, 6402102 + ... + 6402127.

It is an arithmetic number, because the mean of its divisors is an integer number (44814805).

Almost surely, 2^166454977 is an apocalyptic number.

It is an amenable number.

166454977 is a deficient number, since it is larger than the sum of its proper divisors (12804243).

166454977 is a wasteful number, since it uses less digits than its factorization.

166454977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12804242.

The product of its digits is 1270080, while the sum is 49.

The square root of 166454977 is about 12901.7431767959. The cubic root of 166454977 is about 550.0881148081.

The spelling of 166454977 in words is "one hundred sixty-six million, four hundred fifty-four thousand, nine hundred seventy-seven".