5661391894 has 16 divisors (see below), whose sum is σ = 8614805760. Its totient is φ = 2789818920.

The previous prime is 5661391891. The next prime is 5661391907. The reversal of 5661391894 is 4981931665.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 525607 + ... + 536269.

It is an arithmetic number, because the mean of its divisors is an integer number (538425360).

Almost surely, 2^5661391894 is an apocalyptic number.

5661391894 is a deficient number, since it is larger than the sum of its proper divisors (2953413866).

5661391894 is a wasteful number, since it uses less digits than its factorization.

5661391894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14475.

The product of its digits is 1399680, while the sum is 52.

The square root of 5661391894 is about 75242.2214850146. The cubic root of 5661391894 is about 1782.2737317693.

The spelling of 5661391894 in words is "five billion, six hundred sixty-one million, three hundred ninety-one thousand, eight hundred ninety-four".