8137478647 has 2 divisors, whose sum is σ = 8137478648. Its totient is φ = 8137478646.

The previous prime is 8137478599. The next prime is 8137478651. The reversal of 8137478647 is 7468747318.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8137478647 - 2¹⁹ = 8136954359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8137478347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4068739323 + 4068739324.

It is an arithmetic number, because the mean of its divisors is an integer number (4068739324).

Almost surely, 2^8137478647 is an apocalyptic number.

8137478647 is a deficient number, since it is larger than the sum of its proper divisors (1).

8137478647 is an equidigital number, since it uses as much as digits as its factorization.

8137478647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6322176, while the sum is 55.

The square root of 8137478647 is about 90207.9744091397. The cubic root of 8137478647 is about 2011.3915470569.

The spelling of 8137478647 in words is "eight billion, one hundred thirty-seven million, four hundred seventy-eight thousand, six hundred forty-seven".