5661492691 has 4 divisors (see below), whose sum is σ = 5697553312. Its totient is φ = 5625432072.

The previous prime is 5661492671. The next prime is 5661492713. The reversal of 5661492691 is 1962941665.

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

It is a cyclic number.

It is not a de Polignac number, because 5661492691 - 2⁵ = 5661492659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5661492611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18030075 + ... + 18030388.

It is an arithmetic number, because the mean of its divisors is an integer number (1424388328).

Almost surely, 2^5661492691 is an apocalyptic number.

5661492691 is a deficient number, since it is larger than the sum of its proper divisors (36060621).

5661492691 is a wasteful number, since it uses less digits than its factorization.

5661492691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36060620.

The product of its digits is 699840, while the sum is 49.

The square root of 5661492691 is about 75242.8912987798. The cubic root of 5661492691 is about 1782.2843090727.

The spelling of 5661492691 in words is "five billion, six hundred sixty-one million, four hundred ninety-two thousand, six hundred ninety-one".