7878954659 has 2 divisors, whose sum is σ = 7878954660. Its totient is φ = 7878954658.

The previous prime is 7878954649. The next prime is 7878954679. The reversal of 7878954659 is 9564598787.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (9564598787) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7878954659 is a prime.

It is not a weakly prime, because it can be changed into another prime (7878954619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3939477329 + 3939477330.

It is an arithmetic number, because the mean of its divisors is an integer number (3939477330).

Almost surely, 2^7878954659 is an apocalyptic number.

7878954659 is a deficient number, since it is larger than the sum of its proper divisors (1).

7878954659 is an equidigital number, since it uses as much as digits as its factorization.

7878954659 is an evil number, because the sum of its binary digits is even.

The product of its digits is 152409600, while the sum is 68.

The square root of 7878954659 is about 88763.4759290104. The cubic root of 7878954659 is about 1989.8615813253.

The spelling of 7878954659 in words is "seven billion, eight hundred seventy-eight million, nine hundred fifty-four thousand, six hundred fifty-nine".