15651563647 has 2 divisors, whose sum is σ = 15651563648. Its totient is φ = 15651563646.

The previous prime is 15651563611. The next prime is 15651563651. The reversal of 15651563647 is 74636515651.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15651563647 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15651563647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15651561647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7825781823 + 7825781824.

It is an arithmetic number, because the mean of its divisors is an integer number (7825781824).

Almost surely, 2^15651563647 is an apocalyptic number.

15651563647 is a deficient number, since it is larger than the sum of its proper divisors (1).

15651563647 is an equidigital number, since it uses as much as digits as its factorization.

15651563647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2268000, while the sum is 49.

The spelling of 15651563647 in words is "fifteen billion, six hundred fifty-one million, five hundred sixty-three thousand, six hundred forty-seven".