25406905725 has 72 divisors (see below), whose sum is σ = 47789119872. Its totient is φ = 12878236800.

The previous prime is 25406905723. The next prime is 25406905751. The reversal of 25406905725 is 52750960452.

It is not a de Polignac number, because 25406905725 - 2¹ = 25406905723 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25406905723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 796840 + ... + 828110.

It is an arithmetic number, because the mean of its divisors is an integer number (663737776).

Almost surely, 2^25406905725 is an apocalyptic number.

25406905725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25406905725 is a deficient number, since it is larger than the sum of its proper divisors (22382214147).

25406905725 is a wasteful number, since it uses less digits than its factorization.

25406905725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31467 (or 31459 counting only the distinct ones).

The product of its (nonzero) digits is 756000, while the sum is 45.

The spelling of 25406905725 in words is "twenty-five billion, four hundred six million, nine hundred five thousand, seven hundred twenty-five".