25156512210257 has 2 divisors, whose sum is σ = 25156512210258. Its totient is φ = 25156512210256.

The previous prime is 25156512210251. The next prime is 25156512210307. The reversal of 25156512210257 is 75201221565152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14801863487761 + 10354648722496 = 3847319^2 + 3217864^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25156512210257 is a prime.

It is not a weakly prime, because it can be changed into another prime (25156512210251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12578256105128 + 12578256105129.

It is an arithmetic number, because the mean of its divisors is an integer number (12578256105129).

Almost surely, 2^{25156512210257} is an apocalyptic number.

It is an amenable number.

25156512210257 is a deficient number, since it is larger than the sum of its proper divisors (1).

25156512210257 is an equidigital number, since it uses as much as digits as its factorization.

25156512210257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 420000, while the sum is 44.

The spelling of 25156512210257 in words is "twenty-five trillion, one hundred fifty-six billion, five hundred twelve million, two hundred ten thousand, two hundred fifty-seven".