78992440129 has 2 divisors, whose sum is σ = 78992440130. Its totient is φ = 78992440128.

The previous prime is 78992440097. The next prime is 78992440157. The reversal of 78992440129 is 92104429987.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75433721104 + 3558719025 = 274652^2 + 59655^2 .

It is an emirp because it is prime and its reverse (92104429987) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78992440129 - 2⁵ = 78992440097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78992440129.

It is not a weakly prime, because it can be changed into another prime (78992740129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39496220064 + 39496220065.

It is an arithmetic number, because the mean of its divisors is an integer number (39496220065).

Almost surely, 2^78992440129 is an apocalyptic number.

It is an amenable number.

78992440129 is a deficient number, since it is larger than the sum of its proper divisors (1).

78992440129 is an equidigital number, since it uses as much as digits as its factorization.

78992440129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2612736, while the sum is 55.

The spelling of 78992440129 in words is "seventy-eight billion, nine hundred ninety-two million, four hundred forty thousand, one hundred twenty-nine".