2656672766561 has 4 divisors (see below), whose sum is σ = 2898188472624. Its totient is φ = 2415157060500.

The previous prime is 2656672766551. The next prime is 2656672766581. The reversal of 2656672766561 is 1656672766562.

2656672766561 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2656672766561 - 2³⁸ = 2381794859617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2656672766551) 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, 120757853015 + ... + 120757853036.

It is an arithmetic number, because the mean of its divisors is an integer number (724547118156).

Almost surely, 2^{2656672766561} is an apocalyptic number.

It is an amenable number.

2656672766561 is a deficient number, since it is larger than the sum of its proper divisors (241515706063).

2656672766561 is a wasteful number, since it uses less digits than its factorization.

2656672766561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241515706062.

The product of its digits is 228614400, while the sum is 65.

Subtracting from 2656672766561 its reverse (1656672766562), we obtain a palindrome (999999999999).

The spelling of 2656672766561 in words is "two trillion, six hundred fifty-six billion, six hundred seventy-two million, seven hundred sixty-six thousand, five hundred sixty-one".