23451566775557 has 2 divisors, whose sum is σ = 23451566775558. Its totient is φ = 23451566775556.

The previous prime is 23451566775521. The next prime is 23451566775599. The reversal of 23451566775557 is 75557766515432.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21963835260481 + 1487731515076 = 4686559^2 + 1219726^2 .

It is a cyclic number.

It is not a de Polignac number, because 23451566775557 - 2¹⁸ = 23451566513413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23451566775517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11725783387778 + 11725783387779.

It is an arithmetic number, because the mean of its divisors is an integer number (11725783387779).

Almost surely, 2^{23451566775557} is an apocalyptic number.

It is an amenable number.

23451566775557 is a deficient number, since it is larger than the sum of its proper divisors (1).

23451566775557 is an equidigital number, since it uses as much as digits as its factorization.

23451566775557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 926100000, while the sum is 68.

The spelling of 23451566775557 in words is "twenty-three trillion, four hundred fifty-one billion, five hundred sixty-six million, seven hundred seventy-five thousand, five hundred fifty-seven".