2556370965773 has 2 divisors, whose sum is σ = 2556370965774. Its totient is φ = 2556370965772.

The previous prime is 2556370965749. The next prime is 2556370965787. The reversal of 2556370965773 is 3775690736552.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1485895174729 + 1070475791044 = 1218973^2 + 1034638^2 .

It is a cyclic number.

It is not a de Polignac number, because 2556370965773 - 2⁸ = 2556370965517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2556370965703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278185482886 + 1278185482887.

It is an arithmetic number, because the mean of its divisors is an integer number (1278185482887).

Almost surely, 2^{2556370965773} is an apocalyptic number.

It is an amenable number.

2556370965773 is a deficient number, since it is larger than the sum of its proper divisors (1).

2556370965773 is an equidigital number, since it uses as much as digits as its factorization.

2556370965773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 250047000, while the sum is 65.

The spelling of 2556370965773 in words is "two trillion, five hundred fifty-six billion, three hundred seventy million, nine hundred sixty-five thousand, seven hundred seventy-three".