25520031251497 has 2 divisors, whose sum is σ = 25520031251498. Its totient is φ = 25520031251496.

The previous prime is 25520031251483. The next prime is 25520031251641. The reversal of 25520031251497 is 79415213002552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24430322831616 + 1089708419881 = 4942704^2 + 1043891^2 .

It is a cyclic number.

It is not a de Polignac number, because 25520031251497 - 2¹⁹ = 25520030727209 is a prime.

It is not a weakly prime, because it can be changed into another prime (25520031291497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12760015625748 + 12760015625749.

It is an arithmetic number, because the mean of its divisors is an integer number (12760015625749).

Almost surely, 2^{25520031251497} is an apocalyptic number.

It is an amenable number.

25520031251497 is a deficient number, since it is larger than the sum of its proper divisors (1).

25520031251497 is an equidigital number, since it uses as much as digits as its factorization.

25520031251497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756000, while the sum is 46.

The spelling of 25520031251497 in words is "twenty-five trillion, five hundred twenty billion, thirty-one million, two hundred fifty-one thousand, four hundred ninety-seven".