5661894236939 has 2 divisors, whose sum is σ = 5661894236940. Its totient is φ = 5661894236938.

The previous prime is 5661894236909. The next prime is 5661894236981. The reversal of 5661894236939 is 9396324981665.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5661894236939 is a prime.

It is a super-2 number, since 2×5661894236939² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (5661894236909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2830947118469 + 2830947118470.

It is an arithmetic number, because the mean of its divisors is an integer number (2830947118470).

Almost surely, 2^{5661894236939} is an apocalyptic number.

5661894236939 is a deficient number, since it is larger than the sum of its proper divisors (1).

5661894236939 is an equidigital number, since it uses as much as digits as its factorization.

5661894236939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 453496320, while the sum is 71.

The spelling of 5661894236939 in words is "five trillion, six hundred sixty-one billion, eight hundred ninety-four million, two hundred thirty-six thousand, nine hundred thirty-nine".