2556166553711 has 4 divisors (see below), whose sum is σ = 2571848557272. Its totient is φ = 2540484550152.

The previous prime is 2556166553623. The next prime is 2556166553723. The reversal of 2556166553711 is 1173556616552.

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

It is a cyclic number.

It is not a de Polignac number, because 2556166553711 - 2²² = 2556162359407 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 (2556166553771) 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, 7841001536 + ... + 7841001861.

It is an arithmetic number, because the mean of its divisors is an integer number (642962139318).

Almost surely, 2^{2556166553711} is an apocalyptic number.

2556166553711 is a deficient number, since it is larger than the sum of its proper divisors (15682003561).

2556166553711 is a wasteful number, since it uses less digits than its factorization.

2556166553711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15682003560.

The product of its digits is 5670000, while the sum is 53.

The spelling of 2556166553711 in words is "two trillion, five hundred fifty-six billion, one hundred sixty-six million, five hundred fifty-three thousand, seven hundred eleven".