810051663 has 4 divisors (see below), whose sum is σ = 1080068888. Its totient is φ = 540034440.

The previous prime is 810051661. The next prime is 810051667. The reversal of 810051663 is 366150018.

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

It is not a de Polignac number, because 810051663 - 2¹ = 810051661 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 810051663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (810051661) 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, 135008608 + ... + 135008613.

It is an arithmetic number, because the mean of its divisors is an integer number (270017222).

Almost surely, 2^810051663 is an apocalyptic number.

810051663 is a deficient number, since it is larger than the sum of its proper divisors (270017225).

810051663 is a wasteful number, since it uses less digits than its factorization.

810051663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270017224.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 810051663 is about 28461.4065534365. The cubic root of 810051663 is about 932.1895697541.

The spelling of 810051663 in words is "eight hundred ten million, fifty-one thousand, six hundred sixty-three".