5656556551 has 4 divisors (see below), whose sum is σ = 5699736504. Its totient is φ = 5613376600.

The previous prime is 5656556537. The next prime is 5656556569. The reversal of 5656556551 is 1556556565.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1556556565 = 5 ⋅311311313.

It is a cyclic number.

It is not a de Polignac number, because 5656556551 - 2⁹ = 5656556039 is a prime.

It is a super-2 number, since 2×5656556551² = 63993264029322031202, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 5656556495 and 5656556504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5656556351) 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, 21589780 + ... + 21590041.

It is an arithmetic number, because the mean of its divisors is an integer number (1424934126).

Almost surely, 2^5656556551 is an apocalyptic number.

5656556551 is a deficient number, since it is larger than the sum of its proper divisors (43179953).

5656556551 is a wasteful number, since it uses less digits than its factorization.

5656556551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43179952.

The product of its digits is 3375000, while the sum is 49.

The square root of 5656556551 is about 75210.0827748514. The cubic root of 5656556551 is about 1781.7661793493.

The spelling of 5656556551 in words is "five billion, six hundred fifty-six million, five hundred fifty-six thousand, five hundred fifty-one".