5615655621 has 16 divisors (see below), whose sum is σ = 7519374720. Its totient is φ = 3727886400.

The previous prime is 5615655557. The next prime is 5615655631. The reversal of 5615655621 is 1265565165.

It is not a de Polignac number, because 5615655621 - 2⁶ = 5615655557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5615655631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 780840 + ... + 787998.

It is an arithmetic number, because the mean of its divisors is an integer number (469960920).

Almost surely, 2^5615655621 is an apocalyptic number.

It is an amenable number.

5615655621 is a deficient number, since it is larger than the sum of its proper divisors (1903719099).

5615655621 is a wasteful number, since it uses less digits than its factorization.

5615655621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8236.

The product of its digits is 270000, while the sum is 42.

The square root of 5615655621 is about 74937.6782466604. The cubic root of 5615655621 is about 1777.4613076296.

It can be divided in two parts, 5615655 and 621, that added together give a triangular number (5616276 = T₃₃₅₁).

The spelling of 5615655621 in words is "five billion, six hundred fifteen million, six hundred fifty-five thousand, six hundred twenty-one".