2666855977 has 4 divisors (see below), whose sum is σ = 2823729876. Its totient is φ = 2509982080.

The previous prime is 2666855959. The next prime is 2666855981. The reversal of 2666855977 is 7795586662.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1692417321 + 974438656 = 41139^2 + 31216^2 .

It is a cyclic number.

It is not a de Polignac number, because 2666855977 - 2¹¹ = 2666853929 is a prime.

It is a super-2 number, since 2×2666855977² = 14224241604121249058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2666855077) 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, 78436924 + ... + 78436957.

It is an arithmetic number, because the mean of its divisors is an integer number (705932469).

Almost surely, 2^2666855977 is an apocalyptic number.

It is an amenable number.

2666855977 is a deficient number, since it is larger than the sum of its proper divisors (156873899).

2666855977 is a wasteful number, since it uses less digits than its factorization.

2666855977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156873898.

The product of its digits is 38102400, while the sum is 61.

The square root of 2666855977 is about 51641.6109063224. The cubic root of 2666855977 is about 1386.7553630383.

The spelling of 2666855977 in words is "two billion, six hundred sixty-six million, eight hundred fifty-five thousand, nine hundred seventy-seven".