5651665655551 has 4 divisors (see below), whose sum is σ = 5656817585232. Its totient is φ = 5646513725872.

The previous prime is 5651665655543. The next prime is 5651665655609. The reversal of 5651665655551 is 1555565661565.

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 5651665655551 - 2³ = 5651665655543 is a prime.

It is a super-2 number, since 2×5651665655551² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 5651665655551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5651665655501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2575963195 + ... + 2575965388.

It is an arithmetic number, because the mean of its divisors is an integer number (1414204396308).

Almost surely, 2^{5651665655551} is an apocalyptic number.

5651665655551 is a deficient number, since it is larger than the sum of its proper divisors (5151929681).

5651665655551 is a wasteful number, since it uses less digits than its factorization.

5651665655551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5151929680.

The product of its digits is 101250000, while the sum is 61.

The spelling of 5651665655551 in words is "five trillion, six hundred fifty-one billion, six hundred sixty-five million, six hundred fifty-five thousand, five hundred fifty-one".