5661500555 has 4 divisors (see below), whose sum is σ = 6793800672. Its totient is φ = 4529200440.

The previous prime is 5661500549. The next prime is 5661500563. The reversal of 5661500555 is 5550051665.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 5661500555 - 2²⁸ = 5393065099 is a prime.

It is a Duffinian 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, 566150051 + ... + 566150060.

It is an arithmetic number, because the mean of its divisors is an integer number (1698450168).

Almost surely, 2^5661500555 is an apocalyptic number.

5661500555 is a deficient number, since it is larger than the sum of its proper divisors (1132300117).

5661500555 is a wasteful number, since it uses less digits than its factorization.

5661500555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1132300116.

The product of its (nonzero) digits is 112500, while the sum is 38.

The square root of 5661500555 is about 75242.9435561900. The cubic root of 5661500555 is about 1782.2851342895.

The spelling of 5661500555 in words is "five billion, six hundred sixty-one million, five hundred thousand, five hundred fifty-five".