25540679930 has 16 divisors (see below), whose sum is σ = 46266049800. Its totient is φ = 10151199552.

The previous prime is 25540679921. The next prime is 25540679951. The reversal of 25540679930 is 3997604552.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9537670921 + 16003009009 = 97661^2 + 126503^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8132405 + ... + 8135544.

Almost surely, 2^25540679930 is an apocalyptic number.

25540679930 is a deficient number, since it is larger than the sum of its proper divisors (20725369870).

25540679930 is a wasteful number, since it uses less digits than its factorization.

25540679930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16268113.

The product of its (nonzero) digits is 2041200, while the sum is 50.

The spelling of 25540679930 in words is "twenty-five billion, five hundred forty million, six hundred seventy-nine thousand, nine hundred thirty".