25519983641 has 8 divisors (see below), whose sum is σ = 25872355080. Its totient is φ = 25167687552.

The previous prime is 25519983637. The next prime is 25519983667. The reversal of 25519983641 is 14638991552.

It can be written as a sum of positive squares in 4 ways, for example, as 3377353225 + 22142630416 = 58115^2 + 148804^2 .

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 25519983641 - 2² = 25519983637 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25519983611) 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, 1218131 + ... + 1238903.

It is an arithmetic number, because the mean of its divisors is an integer number (3234044385).

Almost surely, 2^25519983641 is an apocalyptic number.

It is an amenable number.

25519983641 is a deficient number, since it is larger than the sum of its proper divisors (352371439).

25519983641 is a wasteful number, since it uses less digits than its factorization.

25519983641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37675.

The product of its digits is 2332800, while the sum is 53.

The spelling of 25519983641 in words is "twenty-five billion, five hundred nineteen million, nine hundred eighty-three thousand, six hundred forty-one".