25228691959 has 4 divisors (see below), whose sum is σ = 25410193480. Its totient is φ = 25047190440.

The previous prime is 25228691933. The next prime is 25228691977. The reversal of 25228691959 is 95919682252.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25228691959 - 2²³ = 25220303351 is a prime.

It is a super-2 number, since 2×25228691959² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25228691989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90750552 + ... + 90750829.

It is an arithmetic number, because the mean of its divisors is an integer number (6352548370).

Almost surely, 2^25228691959 is an apocalyptic number.

25228691959 is a deficient number, since it is larger than the sum of its proper divisors (181501521).

25228691959 is a wasteful number, since it uses less digits than its factorization.

25228691959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181501520.

The product of its digits is 6998400, while the sum is 58.

The spelling of 25228691959 in words is "twenty-five billion, two hundred twenty-eight million, six hundred ninety-one thousand, nine hundred fifty-nine".