56261400066397 has 2 divisors, whose sum is σ = 56261400066398. Its totient is φ = 56261400066396.

The previous prime is 56261400066359. The next prime is 56261400066449. The reversal of 56261400066397 is 79366000416265.

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., 47476661289561 + 8784738776836 = 6890331^2 + 2963906^2 .

It is a cyclic number.

It is not a de Polignac number, because 56261400066397 - 2³⁵ = 56227040328029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56261430066397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28130700033198 + 28130700033199.

It is an arithmetic number, because the mean of its divisors is an integer number (28130700033199).

Almost surely, 2^{56261400066397} is an apocalyptic number.

It is an amenable number.

56261400066397 is a deficient number, since it is larger than the sum of its proper divisors (1).

56261400066397 is an equidigital number, since it uses as much as digits as its factorization.

56261400066397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9797760, while the sum is 55.

The spelling of 56261400066397 in words is "fifty-six trillion, two hundred sixty-one billion, four hundred million, sixty-six thousand, three hundred ninety-seven".