5656665616551 has 6 divisors (see below), whose sum is σ = 8170739223920. Its totient is φ = 3771110411028.

The previous prime is 5656665616543. The next prime is 5656665616577. The reversal of 5656665616551 is 1556165666565.

It is not a de Polignac number, because 5656665616551 - 2³ = 5656665616543 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 (5656665616451) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 314259200911 + ... + 314259200928.

Almost surely, 2^{5656665616551} is an apocalyptic number.

5656665616551 is a deficient number, since it is larger than the sum of its proper divisors (2514073607369).

5656665616551 is a wasteful number, since it uses less digits than its factorization.

5656665616551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628518401845 (or 628518401842 counting only the distinct ones).

The product of its digits is 145800000, while the sum is 63.

The spelling of 5656665616551 in words is "five trillion, six hundred fifty-six billion, six hundred sixty-five million, six hundred sixteen thousand, five hundred fifty-one".