25246549777381 has 2 divisors, whose sum is σ = 25246549777382. Its totient is φ = 25246549777380.

The previous prime is 25246549777363. The next prime is 25246549777387. The reversal of 25246549777381 is 18377794564252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24207964585281 + 1038585192100 = 4920159^2 + 1019110^2 .

It is a cyclic number.

It is not a de Polignac number, because 25246549777381 - 2⁵ = 25246549777349 is a prime.

It is a super-2 number, since 2×25246549777381² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25246549777381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25246549777387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12623274888690 + 12623274888691.

It is an arithmetic number, because the mean of its divisors is an integer number (12623274888691).

Almost surely, 2^{25246549777381} is an apocalyptic number.

It is an amenable number.

25246549777381 is a deficient number, since it is larger than the sum of its proper divisors (1).

25246549777381 is an equidigital number, since it uses as much as digits as its factorization.

25246549777381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 711244800, while the sum is 70.

The spelling of 25246549777381 in words is "twenty-five trillion, two hundred forty-six billion, five hundred forty-nine million, seven hundred seventy-seven thousand, three hundred eighty-one".