78508245799 has 2 divisors, whose sum is σ = 78508245800. Its totient is φ = 78508245798.

The previous prime is 78508245787. The next prime is 78508245833. The reversal of 78508245799 is 99754280587.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78508245799 - 2⁷ = 78508245671 is a prime.

It is a super-2 number, since 2×78508245799² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78508245799.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78508245749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39254122899 + 39254122900.

It is an arithmetic number, because the mean of its divisors is an integer number (39254122900).

Almost surely, 2^78508245799 is an apocalyptic number.

78508245799 is a deficient number, since it is larger than the sum of its proper divisors (1).

78508245799 is an equidigital number, since it uses as much as digits as its factorization.

78508245799 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50803200, while the sum is 64.

The spelling of 78508245799 in words is "seventy-eight billion, five hundred eight million, two hundred forty-five thousand, seven hundred ninety-nine".