15996651503639 has 2 divisors, whose sum is σ = 15996651503640. Its totient is φ = 15996651503638.

The previous prime is 15996651503603. The next prime is 15996651503641. The reversal of 15996651503639 is 93630515669951.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15996651503639 is a prime.

Together with 15996651503641, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15996651503669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7998325751819 + 7998325751820.

It is an arithmetic number, because the mean of its divisors is an integer number (7998325751820).

Almost surely, 2^{15996651503639} is an apocalyptic number.

15996651503639 is a deficient number, since it is larger than the sum of its proper divisors (1).

15996651503639 is an equidigital number, since it uses as much as digits as its factorization.

15996651503639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 177147000, while the sum is 68.

The spelling of 15996651503639 in words is "fifteen trillion, nine hundred ninety-six billion, six hundred fifty-one million, five hundred three thousand, six hundred thirty-nine".