5661391895 has 32 divisors (see below), whose sum is σ = 7174324224. Its totient is φ = 4282761600.

The previous prime is 5661391891. The next prime is 5661391907. The reversal of 5661391895 is 5981931665.

It is not a de Polignac number, because 5661391895 - 2² = 5661391891 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5661391891) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2224994 + ... + 2227536.

It is an arithmetic number, because the mean of its divisors is an integer number (224197632).

Almost surely, 2^5661391895 is an apocalyptic number.

5661391895 is a deficient number, since it is larger than the sum of its proper divisors (1512932329).

5661391895 is a wasteful number, since it uses less digits than its factorization.

5661391895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2903.

The product of its digits is 1749600, while the sum is 53.

The square root of 5661391895 is about 75242.2214916599. The cubic root of 5661391895 is about 1782.2737318742.

The spelling of 5661391895 in words is "five billion, six hundred sixty-one million, three hundred ninety-one thousand, eight hundred ninety-five".