25489938649 has 8 divisors (see below), whose sum is σ = 29133105408. Its totient is φ = 21847208640.

The previous prime is 25489938637. The next prime is 25489938671. The reversal of 25489938649 is 94683998452.

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

It is a cyclic number.

It is not a de Polignac number, because 25489938649 - 2¹¹ = 25489936601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25489938689) 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, 27249 + ... + 227425.

It is an arithmetic number, because the mean of its divisors is an integer number (3641638176).

Almost surely, 2^25489938649 is an apocalyptic number.

It is an amenable number.

25489938649 is a deficient number, since it is larger than the sum of its proper divisors (3643166759).

25489938649 is a wasteful number, since it uses less digits than its factorization.

25489938649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218375.

The product of its digits is 134369280, while the sum is 67.

The spelling of 25489938649 in words is "twenty-five billion, four hundred eighty-nine million, nine hundred thirty-eight thousand, six hundred forty-nine".