122807778309 has 12 divisors (see below), whose sum is σ = 179819000556. Its totient is φ = 80750319552.

The previous prime is 122807778299. The next prime is 122807778343. The reversal of 122807778309 is 903877708221.

122807778309 is a `hidden beast` number, since 122 + 80 + 77 + 78 + 309 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 21234901284 + 101572877025 = 145722^2 + 318705^2 .

It is not a de Polignac number, because 122807778309 - 2⁵ = 122807778277 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122807778389) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 93460362 + ... + 93461675.

It is an arithmetic number, because the mean of its divisors is an integer number (14984916713).

Almost surely, 2^122807778309 is an apocalyptic number.

It is an amenable number.

122807778309 is a deficient number, since it is larger than the sum of its proper divisors (57011222247).

122807778309 is a wasteful number, since it uses less digits than its factorization.

122807778309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186922116 (or 186922113 counting only the distinct ones).

The product of its (nonzero) digits is 2370816, while the sum is 54.

The spelling of 122807778309 in words is "one hundred twenty-two billion, eight hundred seven million, seven hundred seventy-eight thousand, three hundred nine".