25266278531 has 16 divisors (see below), whose sum is σ = 27720645120. Its totient is φ = 22886303520.

The previous prime is 25266278503. The next prime is 25266278549. The reversal of 25266278531 is 13587266252.

It is a cyclic number.

It is not a de Polignac number, because 25266278531 - 2¹⁸ = 25266016387 is a prime.

It is a super-2 number, since 2×25266278531² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25266278551) 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, 402566 + ... + 461076.

It is an arithmetic number, because the mean of its divisors is an integer number (1732540320).

Almost surely, 2^25266278531 is an apocalyptic number.

25266278531 is a deficient number, since it is larger than the sum of its proper divisors (2454366589).

25266278531 is a wasteful number, since it uses less digits than its factorization.

25266278531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59146.

The product of its digits is 1209600, while the sum is 47.

The spelling of 25266278531 in words is "twenty-five billion, two hundred sixty-six million, two hundred seventy-eight thousand, five hundred thirty-one".