25990666903 has 16 divisors (see below), whose sum is σ = 29238693120. Its totient is φ = 22957727616.

The previous prime is 25990666883. The next prime is 25990666921. The reversal of 25990666903 is 30966609952.

It is a cyclic number.

It is not a de Polignac number, because 25990666903 - 2²¹ = 25988569751 is a prime.

It is a super-2 number, since 2×25990666903² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25990666943) 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, 341451 + ... + 410572.

It is an arithmetic number, because the mean of its divisors is an integer number (1827418320).

Almost surely, 2^25990666903 is an apocalyptic number.

25990666903 is a deficient number, since it is larger than the sum of its proper divisors (3248026217).

25990666903 is a wasteful number, since it uses less digits than its factorization.

25990666903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752166.

The product of its (nonzero) digits is 4723920, while the sum is 55.

The spelling of 25990666903 in words is "twenty-five billion, nine hundred ninety million, six hundred sixty-six thousand, nine hundred three".