25729477985 has 8 divisors (see below), whose sum is σ = 32691572136. Its totient is φ = 19372783360.

The previous prime is 25729477909. The next prime is 25729477987. The reversal of 25729477985 is 58977492752.

It can be written as a sum of positive squares in 4 ways, for example, as 5179968784 + 20549509201 = 71972^2 + 143351^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25729477985 - 2¹⁰ = 25729476961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25729477987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151349786 + ... + 151349955.

It is an arithmetic number, because the mean of its divisors is an integer number (4086446517).

Almost surely, 2^25729477985 is an apocalyptic number.

It is an amenable number.

25729477985 is a deficient number, since it is larger than the sum of its proper divisors (6962094151).

25729477985 is a wasteful number, since it uses less digits than its factorization.

25729477985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302699763.

The product of its digits is 88905600, while the sum is 65.

The spelling of 25729477985 in words is "twenty-five billion, seven hundred twenty-nine million, four hundred seventy-seven thousand, nine hundred eighty-five".