6686157547 has 2 divisors, whose sum is σ = 6686157548. Its totient is φ = 6686157546.

The previous prime is 6686157509. The next prime is 6686157559. The reversal of 6686157547 is 7457516866.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6686157547 is a prime.

It is not a weakly prime, because it can be changed into another prime (6686158547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3343078773 + 3343078774.

It is an arithmetic number, because the mean of its divisors is an integer number (3343078774).

Almost surely, 2^6686157547 is an apocalyptic number.

6686157547 is a deficient number, since it is larger than the sum of its proper divisors (1).

6686157547 is an equidigital number, since it uses as much as digits as its factorization.

6686157547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8467200, while the sum is 55.

The square root of 6686157547 is about 81768.9277598771. The cubic root of 6686157547 is about 1883.9044352509.

The spelling of 6686157547 in words is "six billion, six hundred eighty-six million, one hundred fifty-seven thousand, five hundred forty-seven".