5051615661 has 12 divisors (see below), whose sum is σ = 7493988892. Its totient is φ = 3276723456.

The previous prime is 5051615609. The next prime is 5051615663. The reversal of 5051615661 is 1665161505.

It can be written as a sum of positive squares in 2 ways, for example, as 4555440036 + 496175625 = 67494^2 + 22275^2 .

It is not a de Polignac number, because 5051615661 - 2²⁵ = 5018061229 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 (5051615663) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7584676 + ... + 7585341.

Almost surely, 2^5051615661 is an apocalyptic number.

It is an amenable number.

5051615661 is a deficient number, since it is larger than the sum of its proper divisors (2442373231).

5051615661 is a wasteful number, since it uses less digits than its factorization.

5051615661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15170060 (or 15170057 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 5051615661 is about 71074.7188598027. The cubic root of 5051615661 is about 1715.8399171334.

The spelling of 5051615661 in words is "five billion, fifty-one million, six hundred fifteen thousand, six hundred sixty-one".