25640611521499 has 8 divisors (see below), whose sum is σ = 27700073407440. Its totient is φ = 23593593514656.

The previous prime is 25640611521467. The next prime is 25640611521521. The reversal of 25640611521499 is 99412511604652.

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 25640611521499 - 2⁵ = 25640611521467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25640611501499) 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, 3110965489 + ... + 3110973730.

It is an arithmetic number, because the mean of its divisors is an integer number (3462509175930).

Almost surely, 2^{25640611521499} is an apocalyptic number.

25640611521499 is a deficient number, since it is larger than the sum of its proper divisors (2059461885941).

25640611521499 is a wasteful number, since it uses less digits than its factorization.

25640611521499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6221939549.

The product of its (nonzero) digits is 4665600, while the sum is 55.

The spelling of 25640611521499 in words is "twenty-five trillion, six hundred forty billion, six hundred eleven million, five hundred twenty-one thousand, four hundred ninety-nine".