612636800309 has 2 divisors, whose sum is σ = 612636800310. Its totient is φ = 612636800308.

The previous prime is 612636800273. The next prime is 612636800317. The reversal of 612636800309 is 903008636216.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 489139378225 + 123497422084 = 699385^2 + 351422^2 .

It is a cyclic number.

It is not a de Polignac number, because 612636800309 - 2²⁰ = 612635751733 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 612636800309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (612636800339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306318400154 + 306318400155.

It is an arithmetic number, because the mean of its divisors is an integer number (306318400155).

Almost surely, 2^612636800309 is an apocalyptic number.

It is an amenable number.

612636800309 is a deficient number, since it is larger than the sum of its proper divisors (1).

612636800309 is an equidigital number, since it uses as much as digits as its factorization.

612636800309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 44.

The spelling of 612636800309 in words is "six hundred twelve billion, six hundred thirty-six million, eight hundred thousand, three hundred nine".