10345778309 has 2 divisors, whose sum is σ = 10345778310. Its totient is φ = 10345778308.

The previous prime is 10345778299. The next prime is 10345778323. The reversal of 10345778309 is 90387754301.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10231929409 + 113848900 = 101153^2 + 10670^2 .

It is a cyclic number.

It is not a de Polignac number, because 10345778309 - 2²⁴ = 10329001093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10345778329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5172889154 + 5172889155.

It is an arithmetic number, because the mean of its divisors is an integer number (5172889155).

Almost surely, 2^10345778309 is an apocalyptic number.

It is an amenable number.

10345778309 is a deficient number, since it is larger than the sum of its proper divisors (1).

10345778309 is an equidigital number, since it uses as much as digits as its factorization.

10345778309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 635040, while the sum is 47.

The spelling of 10345778309 in words is "ten billion, three hundred forty-five million, seven hundred seventy-eight thousand, three hundred nine".