78394603739 has 2 divisors, whose sum is σ = 78394603740. Its totient is φ = 78394603738.

The previous prime is 78394603697. The next prime is 78394603741. The reversal of 78394603739 is 93730649387.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78394603739 - 2²⁸ = 78126168283 is a prime.

It is a super-2 number, since 2×78394603739² (a number of 23 digits) contains 22 as substring.

Together with 78394603741, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78394603799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39197301869 + 39197301870.

It is an arithmetic number, because the mean of its divisors is an integer number (39197301870).

Almost surely, 2^78394603739 is an apocalyptic number.

78394603739 is a deficient number, since it is larger than the sum of its proper divisors (1).

78394603739 is an equidigital number, since it uses as much as digits as its factorization.

78394603739 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20575296, while the sum is 59.

The spelling of 78394603739 in words is "seventy-eight billion, three hundred ninety-four million, six hundred three thousand, seven hundred thirty-nine".