25946267457557 has 2 divisors, whose sum is σ = 25946267457558. Its totient is φ = 25946267457556.

The previous prime is 25946267457541. The next prime is 25946267457571. The reversal of 25946267457557 is 75575476264952.

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., 14704724686276 + 11241542771281 = 3834674^2 + 3352841^2 .

It is a cyclic number.

It is not a de Polignac number, because 25946267457557 - 2⁴ = 25946267457541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25946267457457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12973133728778 + 12973133728779.

It is an arithmetic number, because the mean of its divisors is an integer number (12973133728779).

Almost surely, 2^{25946267457557} is an apocalyptic number.

It is an amenable number.

25946267457557 is a deficient number, since it is larger than the sum of its proper divisors (1).

25946267457557 is an equidigital number, since it uses as much as digits as its factorization.

25946267457557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4445280000, while the sum is 74.

The spelling of 25946267457557 in words is "twenty-five trillion, nine hundred forty-six billion, two hundred sixty-seven million, four hundred fifty-seven thousand, five hundred fifty-seven".