25649578508 has 24 divisors (see below), whose sum is σ = 44992444560. Its totient is φ = 12794633280.

The previous prime is 25649578501. The next prime is 25649578543. The reversal of 25649578508 is 80587594652.

It is not an unprimeable number, because it can be changed into a prime (25649578501) 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, 3229310 + ... + 3237242.

It is an arithmetic number, because the mean of its divisors is an integer number (1874685190).

Almost surely, 2^25649578508 is an apocalyptic number.

It is an amenable number.

25649578508 is a deficient number, since it is larger than the sum of its proper divisors (19342866052).

25649578508 is a wasteful number, since it uses less digits than its factorization.

25649578508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9737 (or 9735 counting only the distinct ones).

The product of its (nonzero) digits is 24192000, while the sum is 59.

The spelling of 25649578508 in words is "twenty-five billion, six hundred forty-nine million, five hundred seventy-eight thousand, five hundred eight".