816890135263 has 4 divisors (see below), whose sum is σ = 818055457128. Its totient is φ = 815724813400.

The previous prime is 816890135251. The next prime is 816890135287. The reversal of 816890135263 is 362531098618.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 816890135263 - 2⁹ = 816890134751 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 816890135263.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816890135563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 582659881 + ... + 582661282.

It is an arithmetic number, because the mean of its divisors is an integer number (204513864282).

Almost surely, 2^816890135263 is an apocalyptic number.

816890135263 is a deficient number, since it is larger than the sum of its proper divisors (1165321865).

816890135263 is a wasteful number, since it uses less digits than its factorization.

816890135263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1165321864.

The product of its (nonzero) digits is 1866240, while the sum is 52.

The spelling of 816890135263 in words is "eight hundred sixteen billion, eight hundred ninety million, one hundred thirty-five thousand, two hundred sixty-three".