25406103261 has 16 divisors (see below), whose sum is σ = 42233522688. Its totient is φ = 13197975600.

The previous prime is 25406103259. The next prime is 25406103263. The reversal of 25406103261 is 16230160452.

It is an interprime number because it is at equal distance from previous prime (25406103259) and next prime (25406103263).

It is not a de Polignac number, because 25406103261 - 2¹ = 25406103259 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25406103263) 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, 54991335 + ... + 54991796.

It is an arithmetic number, because the mean of its divisors is an integer number (2639595168).

Almost surely, 2^25406103261 is an apocalyptic number.

25406103261 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25406103261 is a deficient number, since it is larger than the sum of its proper divisors (16827419427).

25406103261 is a wasteful number, since it uses less digits than its factorization.

25406103261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109983152.

The product of its (nonzero) digits is 8640, while the sum is 30.

The spelling of 25406103261 in words is "twenty-five billion, four hundred six million, one hundred three thousand, two hundred sixty-one".