78585872947 has 2 divisors, whose sum is σ = 78585872948. Its totient is φ = 78585872946.

The previous prime is 78585872891. The next prime is 78585873019. The reversal of 78585872947 is 74927858587.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78585872947 - 2⁷ = 78585872819 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (78585872347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39292936473 + 39292936474.

It is an arithmetic number, because the mean of its divisors is an integer number (39292936474).

Almost surely, 2^78585872947 is an apocalyptic number.

78585872947 is a deficient number, since it is larger than the sum of its proper divisors (1).

78585872947 is an equidigital number, since it uses as much as digits as its factorization.

78585872947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 316108800, while the sum is 70.

The spelling of 78585872947 in words is "seventy-eight billion, five hundred eighty-five million, eight hundred seventy-two thousand, nine hundred forty-seven".