56540404357 has 2 divisors, whose sum is σ = 56540404358. Its totient is φ = 56540404356.

The previous prime is 56540404331. The next prime is 56540404381. The reversal of 56540404357 is 75340404565.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56529342081 + 11062276 = 237759^2 + 3326^2 .

It is a cyclic number.

It is not a de Polignac number, because 56540404357 - 2¹¹ = 56540402309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56540404387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28270202178 + 28270202179.

It is an arithmetic number, because the mean of its divisors is an integer number (28270202179).

Almost surely, 2^56540404357 is an apocalyptic number.

It is an amenable number.

56540404357 is a deficient number, since it is larger than the sum of its proper divisors (1).

56540404357 is an equidigital number, since it uses as much as digits as its factorization.

56540404357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008000, while the sum is 43.

The spelling of 56540404357 in words is "fifty-six billion, five hundred forty million, four hundred four thousand, three hundred fifty-seven".