25783474649 has 8 divisors (see below), whose sum is σ = 26603528448. Its totient is φ = 24974732160.

The previous prime is 25783474631. The next prime is 25783474709. The reversal of 25783474649 is 94647438752.

It is a happy number.

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

It is not a de Polignac number, because 25783474649 - 2¹² = 25783470553 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25783473649) 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, 2823197 + ... + 2832314.

It is an arithmetic number, because the mean of its divisors is an integer number (3325441056).

Almost surely, 2^25783474649 is an apocalyptic number.

It is an amenable number.

25783474649 is a deficient number, since it is larger than the sum of its proper divisors (820053799).

25783474649 is an equidigital number, since it uses as much as digits as its factorization.

25783474649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5655655.

The product of its digits is 40642560, while the sum is 59.

The spelling of 25783474649 in words is "twenty-five billion, seven hundred eighty-three million, four hundred seventy-four thousand, six hundred forty-nine".