15646318349 has 2 divisors, whose sum is σ = 15646318350. Its totient is φ = 15646318348.

The previous prime is 15646318319. The next prime is 15646318411. The reversal of 15646318349 is 94381364651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11226462025 + 4419856324 = 105955^2 + 66482^2 .

It is a cyclic number.

It is not a de Polignac number, because 15646318349 - 2²⁸ = 15377882893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15646318297 and 15646318306.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15646318319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7823159174 + 7823159175.

It is an arithmetic number, because the mean of its divisors is an integer number (7823159175).

Almost surely, 2^15646318349 is an apocalyptic number.

It is an amenable number.

15646318349 is a deficient number, since it is larger than the sum of its proper divisors (1).

15646318349 is an equidigital number, since it uses as much as digits as its factorization.

15646318349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1866240, while the sum is 50.

The spelling of 15646318349 in words is "fifteen billion, six hundred forty-six million, three hundred eighteen thousand, three hundred forty-nine".