25778157157 has 2 divisors, whose sum is σ = 25778157158. Its totient is φ = 25778157156.

The previous prime is 25778157151. The next prime is 25778157239. The reversal of 25778157157 is 75175187752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17276210721 + 8501946436 = 131439^2 + 92206^2 .

It is a cyclic number.

It is not a de Polignac number, because 25778157157 - 2¹⁹ = 25777632869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25778157098 and 25778157107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25778157151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12889078578 + 12889078579.

It is an arithmetic number, because the mean of its divisors is an integer number (12889078579).

Almost surely, 2^25778157157 is an apocalyptic number.

It is an amenable number.

25778157157 is a deficient number, since it is larger than the sum of its proper divisors (1).

25778157157 is an equidigital number, since it uses as much as digits as its factorization.

25778157157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4802000, while the sum is 55.

The spelling of 25778157157 in words is "twenty-five billion, seven hundred seventy-eight million, one hundred fifty-seven thousand, one hundred fifty-seven".