25663399203 has 32 divisors (see below), whose sum is σ = 37449974016. Its totient is φ = 15536366208.

The previous prime is 25663399163. The next prime is 25663399207. The reversal of 25663399203 is 30299336652.

It is a Cunningham number, because it is equal to 160198²-1.

It is not a de Polignac number, because 25663399203 - 2²⁶ = 25596290339 is a prime.

It is a super-2 number, since 2×25663399203² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25663399207) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2076400 + ... + 2088722.

It is an arithmetic number, because the mean of its divisors is an integer number (1170311688).

Almost surely, 2^25663399203 is an apocalyptic number.

25663399203 is a deficient number, since it is larger than the sum of its proper divisors (11786574813).

25663399203 is a wasteful number, since it uses less digits than its factorization.

25663399203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13203.

The product of its (nonzero) digits is 1574640, while the sum is 48.

The spelling of 25663399203 in words is "twenty-five billion, six hundred sixty-three million, three hundred ninety-nine thousand, two hundred three".