78340635599 has 2 divisors, whose sum is σ = 78340635600. Its totient is φ = 78340635598.

The previous prime is 78340635559. The next prime is 78340635661. The reversal of 78340635599 is 99553604387.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78340635599 - 2¹² = 78340631503 is a prime.

It is a super-2 number, since 2×78340635599² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78340635559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39170317799 + 39170317800.

It is an arithmetic number, because the mean of its divisors is an integer number (39170317800).

Almost surely, 2^78340635599 is an apocalyptic number.

78340635599 is a deficient number, since it is larger than the sum of its proper divisors (1).

78340635599 is an equidigital number, since it uses as much as digits as its factorization.

78340635599 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24494400, while the sum is 59.

The spelling of 78340635599 in words is "seventy-eight billion, three hundred forty million, six hundred thirty-five thousand, five hundred ninety-nine".