78113209879 has 2 divisors, whose sum is σ = 78113209880. Its totient is φ = 78113209878.

The previous prime is 78113209841. The next prime is 78113209931. The reversal of 78113209879 is 97890231187.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78113209879 - 2¹⁵ = 78113177111 is a prime.

It is a super-2 number, since 2×78113209879² (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 (78113209379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39056604939 + 39056604940.

It is an arithmetic number, because the mean of its divisors is an integer number (39056604940).

Almost surely, 2^78113209879 is an apocalyptic number.

78113209879 is a deficient number, since it is larger than the sum of its proper divisors (1).

78113209879 is an equidigital number, since it uses as much as digits as its factorization.

78113209879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1524096, while the sum is 55.

The spelling of 78113209879 in words is "seventy-eight billion, one hundred thirteen million, two hundred nine thousand, eight hundred seventy-nine".