16506551263 has 2 divisors, whose sum is σ = 16506551264. Its totient is φ = 16506551262.

The previous prime is 16506551231. The next prime is 16506551317. The reversal of 16506551263 is 36215560561.

It is a weak prime.

It is an emirp because it is prime and its reverse (36215560561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16506551263 - 2⁵ = 16506551231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16506551203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8253275631 + 8253275632.

It is an arithmetic number, because the mean of its divisors is an integer number (8253275632).

Almost surely, 2^16506551263 is an apocalyptic number.

16506551263 is a deficient number, since it is larger than the sum of its proper divisors (1).

16506551263 is an equidigital number, since it uses as much as digits as its factorization.

16506551263 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162000, while the sum is 40.

The spelling of 16506551263 in words is "sixteen billion, five hundred six million, five hundred fifty-one thousand, two hundred sixty-three".