25015646611663 has 2 divisors, whose sum is σ = 25015646611664. Its totient is φ = 25015646611662.

The previous prime is 25015646611651. The next prime is 25015646611687. The reversal of 25015646611663 is 36611664651052.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25015646611663 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25015646611663.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25015646611603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12507823305831 + 12507823305832.

It is an arithmetic number, because the mean of its divisors is an integer number (12507823305832).

Almost surely, 2^{25015646611663} is an apocalyptic number.

25015646611663 is a deficient number, since it is larger than the sum of its proper divisors (1).

25015646611663 is an equidigital number, since it uses as much as digits as its factorization.

25015646611663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4665600, while the sum is 52.

The spelling of 25015646611663 in words is "twenty-five trillion, fifteen billion, six hundred forty-six million, six hundred eleven thousand, six hundred sixty-three".