5661503566 has 16 divisors (see below), whose sum is σ = 8656927488. Its totient is φ = 2775916000.

The previous prime is 5661503531. The next prime is 5661503597. The reversal of 5661503566 is 6653051665.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211116 + ... + 236416.

It is an arithmetic number, because the mean of its divisors is an integer number (541057968).

Almost surely, 2^5661503566 is an apocalyptic number.

5661503566 is a deficient number, since it is larger than the sum of its proper divisors (2995423922).

5661503566 is a wasteful number, since it uses less digits than its factorization.

5661503566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27467.

The product of its (nonzero) digits is 486000, while the sum is 43.

The square root of 5661503566 is about 75242.9635647082. The cubic root of 5661503566 is about 1782.2854502517.

The spelling of 5661503566 in words is "five billion, six hundred sixty-one million, five hundred three thousand, five hundred sixty-six".