15640502243 has 2 divisors, whose sum is σ = 15640502244. Its totient is φ = 15640502242.

The previous prime is 15640502237. The next prime is 15640502263. The reversal of 15640502243 is 34220504651.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15640502243 is a prime.

It is not a weakly prime, because it can be changed into another prime (15640502263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7820251121 + 7820251122.

It is an arithmetic number, because the mean of its divisors is an integer number (7820251122).

Almost surely, 2^15640502243 is an apocalyptic number.

15640502243 is a deficient number, since it is larger than the sum of its proper divisors (1).

15640502243 is an equidigital number, since it uses as much as digits as its factorization.

15640502243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28800, while the sum is 32.

The spelling of 15640502243 in words is "fifteen billion, six hundred forty million, five hundred two thousand, two hundred forty-three".