2166256754 has 4 divisors (see below), whose sum is σ = 3249385134. Its totient is φ = 1083128376.

The previous prime is 2166256717. The next prime is 2166256783. The reversal of 2166256754 is 4576526612.

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

It can be written as a sum of positive squares in only one way, i.e., 1713546025 + 452710729 = 41395^2 + 21277^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 541564187 + ... + 541564190.

Almost surely, 2^2166256754 is an apocalyptic number.

2166256754 is a deficient number, since it is larger than the sum of its proper divisors (1083128380).

2166256754 is a wasteful number, since it uses less digits than its factorization.

2166256754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083128379.

The product of its digits is 604800, while the sum is 44.

The square root of 2166256754 is about 46543.0634359192. The cubic root of 2166256754 is about 1293.9077374821.

The spelling of 2166256754 in words is "two billion, one hundred sixty-six million, two hundred fifty-six thousand, seven hundred fifty-four".