5106621665 has 4 divisors (see below), whose sum is σ = 6127946004. Its totient is φ = 4085297328.

The previous prime is 5106621643. The next prime is 5106621701. The reversal of 5106621665 is 5661266015.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5661266015 = 5 ⋅1132253203.

It can be written as a sum of positive squares in 2 ways, for example, as 2916756049 + 2189865616 = 54007^2 + 46796^2 .

It is a cyclic number.

It is not a de Polignac number, because 5106621665 - 2²⁴ = 5089844449 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 510662162 + ... + 510662171.

It is an arithmetic number, because the mean of its divisors is an integer number (1531986501).

Almost surely, 2^5106621665 is an apocalyptic number.

It is an amenable number.

5106621665 is a deficient number, since it is larger than the sum of its proper divisors (1021324339).

5106621665 is a wasteful number, since it uses less digits than its factorization.

5106621665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021324338.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 5106621665 is about 71460.6301749432. The cubic root of 5106621665 is about 1722.0452577694.

The spelling of 5106621665 in words is "five billion, one hundred six million, six hundred twenty-one thousand, six hundred sixty-five".