15438768647 has 2 divisors, whose sum is σ = 15438768648. Its totient is φ = 15438768646.

The previous prime is 15438768619. The next prime is 15438768689. The reversal of 15438768647 is 74686783451.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15438768647 - 2²² = 15434574343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15438768617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7719384323 + 7719384324.

It is an arithmetic number, because the mean of its divisors is an integer number (7719384324).

Almost surely, 2^15438768647 is an apocalyptic number.

15438768647 is a deficient number, since it is larger than the sum of its proper divisors (1).

15438768647 is an equidigital number, since it uses as much as digits as its factorization.

15438768647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27095040, while the sum is 59.

The spelling of 15438768647 in words is "fifteen billion, four hundred thirty-eight million, seven hundred sixty-eight thousand, six hundred forty-seven".