16539640291 has 2 divisors, whose sum is σ = 16539640292. Its totient is φ = 16539640290.

The previous prime is 16539640279. The next prime is 16539640339. The reversal of 16539640291 is 19204693561.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16539640291 is a prime.

It is not a weakly prime, because it can be changed into another prime (16539640591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8269820145 + 8269820146.

It is an arithmetic number, because the mean of its divisors is an integer number (8269820146).

Almost surely, 2^16539640291 is an apocalyptic number.

16539640291 is a deficient number, since it is larger than the sum of its proper divisors (1).

16539640291 is an equidigital number, since it uses as much as digits as its factorization.

16539640291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 349920, while the sum is 46.

The spelling of 16539640291 in words is "sixteen billion, five hundred thirty-nine million, six hundred forty thousand, two hundred ninety-one".