25989989990 has 16 divisors (see below), whose sum is σ = 49244191920. Its totient is φ = 9848838240.

The previous prime is 25989989983. The next prime is 25989989999. The reversal of 25989989990 is 9998998952.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25989989999) 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, 68394521 + ... + 68394900.

It is an arithmetic number, because the mean of its divisors is an integer number (3077761995).

Almost surely, 2^25989989990 is an apocalyptic number.

25989989990 is a deficient number, since it is larger than the sum of its proper divisors (23254201930).

25989989990 is a wasteful number, since it uses less digits than its factorization.

25989989990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136789447.

The product of its (nonzero) digits is 340122240, while the sum is 77.

The spelling of 25989989990 in words is "twenty-five billion, nine hundred eighty-nine million, nine hundred eighty-nine thousand, nine hundred ninety".