25430138188 has 36 divisors (see below), whose sum is σ = 55750693152. Its totient is φ = 10060273440.

The previous prime is 25430138179. The next prime is 25430138189. The reversal of 25430138188 is 88183103452.

It is not an unprimeable number, because it can be changed into a prime (25430138189) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4987668 + ... + 4992763.

Almost surely, 2^25430138188 is an apocalyptic number.

25430138188 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

25430138188 is an abundant number, since it is smaller than the sum of its proper divisors (30320554964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25430138188 is a wasteful number, since it uses less digits than its factorization.

25430138188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9980462 (or 9980453 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 43.

The spelling of 25430138188 in words is "twenty-five billion, four hundred thirty million, one hundred thirty-eight thousand, one hundred eighty-eight".