15379978709 has 2 divisors, whose sum is σ = 15379978710. Its totient is φ = 15379978708.

The previous prime is 15379978687. The next prime is 15379978769. The reversal of 15379978709 is 90787997351.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12645002500 + 2734976209 = 112450^2 + 52297^2 .

It is an emirp because it is prime and its reverse (90787997351) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15379978709 - 2²⁴ = 15363201493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15379978769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7689989354 + 7689989355.

It is an arithmetic number, because the mean of its divisors is an integer number (7689989355).

Almost surely, 2^15379978709 is an apocalyptic number.

It is an amenable number.

15379978709 is a deficient number, since it is larger than the sum of its proper divisors (1).

15379978709 is an equidigital number, since it uses as much as digits as its factorization.

15379978709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30005640, while the sum is 65.

The spelling of 15379978709 in words is "fifteen billion, three hundred seventy-nine million, nine hundred seventy-eight thousand, seven hundred nine".