25660040437 has 2 divisors, whose sum is σ = 25660040438. Its totient is φ = 25660040436.

The previous prime is 25660040383. The next prime is 25660040467. The reversal of 25660040437 is 73404006652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18813139921 + 6846900516 = 137161^2 + 82746^2 .

It is a cyclic number.

It is not a de Polignac number, because 25660040437 - 2⁷ = 25660040309 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25660040396 and 25660040405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25660040467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12830020218 + 12830020219.

It is an arithmetic number, because the mean of its divisors is an integer number (12830020219).

Almost surely, 2^25660040437 is an apocalyptic number.

It is an amenable number.

25660040437 is a deficient number, since it is larger than the sum of its proper divisors (1).

25660040437 is an equidigital number, since it uses as much as digits as its factorization.

25660040437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 37.

The spelling of 25660040437 in words is "twenty-five billion, six hundred sixty million, forty thousand, four hundred thirty-seven".