25406533044 has 36 divisors (see below), whose sum is σ = 65433811716. Its totient is φ = 8309054208.

The previous prime is 25406533021. The next prime is 25406533049. The reversal of 25406533044 is 44033560452.

It can be written as a sum of positive squares in 2 ways, for example, as 17105500944 + 8301032100 = 130788^2 + 91110^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25406533049) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6655989 + ... + 6659804.

It is an arithmetic number, because the mean of its divisors is an integer number (1817605881).

Almost surely, 2^25406533044 is an apocalyptic number.

It is an amenable number.

25406533044 is an abundant number, since it is smaller than the sum of its proper divisors (40027278672).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25406533044 is a wasteful number, since it uses less digits than its factorization.

25406533044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13315856 (or 13315851 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 36.

The spelling of 25406533044 in words is "twenty-five billion, four hundred six million, five hundred thirty-three thousand, forty-four".