25723881585 has 96 divisors (see below), whose sum is σ = 49047223680. Its totient is φ = 12889248768.

The previous prime is 25723881581. The next prime is 25723881607. The reversal of 25723881585 is 58518832752.

25723881585 is a `hidden beast` number, since 2 + 57 + 2 + 3 + 8 + 8 + 1 + 585 = 666.

It is not a de Polignac number, because 25723881585 - 2² = 25723881581 is a prime.

It is a super-2 number, since 2×25723881585² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25723881581) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 22905834 + ... + 22906956.

It is an arithmetic number, because the mean of its divisors is an integer number (510908580).

Almost surely, 2^25723881585 is an apocalyptic number.

It is an amenable number.

25723881585 is a deficient number, since it is larger than the sum of its proper divisors (23323342095).

25723881585 is a wasteful number, since it uses less digits than its factorization.

25723881585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2269 (or 2257 counting only the distinct ones).

The product of its digits is 5376000, while the sum is 54.

The spelling of 25723881585 in words is "twenty-five billion, seven hundred twenty-three million, eight hundred eighty-one thousand, five hundred eighty-five".