25631042017 has 16 divisors (see below), whose sum is σ = 30355264512. Its totient is φ = 21177999360.

The previous prime is 25631042011. The next prime is 25631042023. The reversal of 25631042017 is 71024013652.

It is an interprime number because it is at equal distance from previous prime (25631042011) and next prime (25631042023).

It is not a de Polignac number, because 25631042017 - 2²³ = 25622653409 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25631042017.

It is not an unprimeable number, because it can be changed into a prime (25631042011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174028 + ... + 285565.

It is an arithmetic number, because the mean of its divisors is an integer number (1897204032).

Almost surely, 2^25631042017 is an apocalyptic number.

It is an amenable number.

25631042017 is a deficient number, since it is larger than the sum of its proper divisors (4724222495).

25631042017 is a wasteful number, since it uses less digits than its factorization.

25631042017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459888.

The product of its (nonzero) digits is 10080, while the sum is 31.

Adding to 25631042017 its reverse (71024013652), we get a palindrome (96655055669).

The spelling of 25631042017 in words is "twenty-five billion, six hundred thirty-one million, forty-two thousand, seventeen".