2656515551 has 4 divisors (see below), whose sum is σ = 2671356600. Its totient is φ = 2641674504.

The previous prime is 2656515509. The next prime is 2656515553. The reversal of 2656515551 is 1555156562.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1555156562 = 2 ⋅777578281.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2656515551 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2656515499 and 2656515508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2656515553) 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, 7420256 + ... + 7420613.

It is an arithmetic number, because the mean of its divisors is an integer number (667839150).

Almost surely, 2^2656515551 is an apocalyptic number.

2656515551 is a deficient number, since it is larger than the sum of its proper divisors (14841049).

2656515551 is a wasteful number, since it uses less digits than its factorization.

2656515551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14841048.

The product of its digits is 225000, while the sum is 41.

The square root of 2656515551 is about 51541.3964789469. The cubic root of 2656515551 is about 1384.9607136089.

The spelling of 2656515551 in words is "two billion, six hundred fifty-six million, five hundred fifteen thousand, five hundred fifty-one".