25406913573 has 24 divisors (see below), whose sum is σ = 37768046400. Its totient is φ = 16880328648.

The previous prime is 25406913541. The next prime is 25406913577. The reversal of 25406913573 is 37531960452.

25406913573 is a `hidden beast` number, since 2 + 5 + 4 + 0 + 69 + 13 + 573 = 666.

It is not a de Polignac number, because 25406913573 - 2⁵ = 25406913541 is a prime.

It is a super-2 number, since 2×25406913573² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25406913577) 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, 15692158 + ... + 15693776.

It is an arithmetic number, because the mean of its divisors is an integer number (1573668600).

Almost surely, 2^25406913573 is an apocalyptic number.

It is an amenable number.

25406913573 is a deficient number, since it is larger than the sum of its proper divisors (12361132827).

25406913573 is an frugal number, since it uses more digits than its factorization.

25406913573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3606 (or 1981 counting only the distinct ones).

The product of its (nonzero) digits is 680400, while the sum is 45.

The spelling of 25406913573 in words is "twenty-five billion, four hundred six million, nine hundred thirteen thousand, five hundred seventy-three".