5657516236781 has 2 divisors, whose sum is σ = 5657516236782. Its totient is φ = 5657516236780.

The previous prime is 5657516236753. The next prime is 5657516236829. The reversal of 5657516236781 is 1876326157565.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5138336904100 + 519179332681 = 2266790^2 + 720541^2 .

It is a cyclic number.

It is not a de Polignac number, because 5657516236781 - 2¹⁴ = 5657516220397 is a prime.

It is a super-2 number, since 2×5657516236781² (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 (5657516236711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2828758118390 + 2828758118391.

It is an arithmetic number, because the mean of its divisors is an integer number (2828758118391).

Almost surely, 2^{5657516236781} is an apocalyptic number.

It is an amenable number.

5657516236781 is a deficient number, since it is larger than the sum of its proper divisors (1).

5657516236781 is an equidigital number, since it uses as much as digits as its factorization.

5657516236781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504000, while the sum is 62.

The spelling of 5657516236781 in words is "five trillion, six hundred fifty-seven billion, five hundred sixteen million, two hundred thirty-six thousand, seven hundred eighty-one".