5656053311981 has 2 divisors, whose sum is σ = 5656053311982. Its totient is φ = 5656053311980.

The previous prime is 5656053311959. The next prime is 5656053312031. The reversal of 5656053311981 is 1891133506565.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5649016618756 + 7036693225 = 2376766^2 + 83885^2 .

It is a cyclic number.

It is not a de Polignac number, because 5656053311981 - 2¹⁴ = 5656053295597 is a prime.

It is a super-2 number, since 2×5656053311981² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5656053311921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2828026655990 + 2828026655991.

It is an arithmetic number, because the mean of its divisors is an integer number (2828026655991).

Almost surely, 2^{5656053311981} is an apocalyptic number.

It is an amenable number.

5656053311981 is a deficient number, since it is larger than the sum of its proper divisors (1).

5656053311981 is an equidigital number, since it uses as much as digits as its factorization.

5656053311981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916000, while the sum is 53.

The spelling of 5656053311981 in words is "five trillion, six hundred fifty-six billion, fifty-three million, three hundred eleven thousand, nine hundred eighty-one".