78264771239 has 2 divisors, whose sum is σ = 78264771240. Its totient is φ = 78264771238.

The previous prime is 78264771227. The next prime is 78264771269. The reversal of 78264771239 is 93217746287.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78264771239 - 2⁴ = 78264771223 is a prime.

It is a super-2 number, since 2×78264771239² (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 (78264771269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39132385619 + 39132385620.

It is an arithmetic number, because the mean of its divisors is an integer number (39132385620).

Almost surely, 2^78264771239 is an apocalyptic number.

78264771239 is a deficient number, since it is larger than the sum of its proper divisors (1).

78264771239 is an equidigital number, since it uses as much as digits as its factorization.

78264771239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7112448, while the sum is 56.

The spelling of 78264771239 in words is "seventy-eight billion, two hundred sixty-four million, seven hundred seventy-one thousand, two hundred thirty-nine".