25401663 has 24 divisors (see below), whose sum is σ = 42172416. Its totient is φ = 14432400.

The previous prime is 25401661. The next prime is 25401671. The reversal of 25401663 is 36610452.

It is not a de Polignac number, because 25401663 - 2¹ = 25401661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25401661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10978 + ... + 13088.

It is an arithmetic number, because the mean of its divisors is an integer number (1757184).

Almost surely, 2^25401663 is an apocalyptic number.

25401663 is a deficient number, since it is larger than the sum of its proper divisors (16770753).

25401663 is a wasteful number, since it uses less digits than its factorization.

25401663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2315 (or 2312 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 25401663 is about 5040.0062499961. The cubic root of 25401663 is about 293.9594210272.

It can be divided in two parts, 254016 and 63, that multiplied together give a cube (16003008 = 252³).

The spelling of 25401663 in words is "twenty-five million, four hundred one thousand, six hundred sixty-three".