5661991744 has 28 divisors (see below), whose sum is σ = 11370893184. Its totient is φ = 2796884864.

The previous prime is 5661991739. The next prime is 5661991789. The reversal of 5661991744 is 4471991665.

It is a junction number, because it is equal to n+sod(n) for n = 5661991691 and 5661991700.

It is a congruent 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, 527632 + ... + 538255.

It is an arithmetic number, because the mean of its divisors is an integer number (406103328).

Almost surely, 2^5661991744 is an apocalyptic number.

It is an amenable number.

5661991744 is an abundant number, since it is smaller than the sum of its proper divisors (5708901440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

5661991744 is a wasteful number, since it uses less digits than its factorization.

5661991744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065982 (or 1065972 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 52.

The square root of 5661991744 is about 75246.2075057607. The cubic root of 5661991744 is about 1782.3366761925.

The spelling of 5661991744 in words is "five billion, six hundred sixty-one million, nine hundred ninety-one thousand, seven hundred forty-four".