25138865890 has 16 divisors (see below), whose sum is σ = 45256713408. Its totient is φ = 10054045296.

The previous prime is 25138865881. The next prime is 25138865893. The reversal of 25138865890 is 9856883152.

It is not an unprimeable number, because it can be changed into a prime (25138865893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115992 + ... + 252451.

It is an arithmetic number, because the mean of its divisors is an integer number (2828544588).

Almost surely, 2^25138865890 is an apocalyptic number.

25138865890 is a deficient number, since it is larger than the sum of its proper divisors (20117847518).

25138865890 is a wasteful number, since it uses less digits than its factorization.

25138865890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375273.

The product of its (nonzero) digits is 4147200, while the sum is 55.

The spelling of 25138865890 in words is "twenty-five billion, one hundred thirty-eight million, eight hundred sixty-five thousand, eight hundred ninety".