816801077 has 4 divisors (see below), whose sum is σ = 818425440. Its totient is φ = 815176716.

The previous prime is 816801071. The next prime is 816801079. The reversal of 816801077 is 770108618.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 770108618 = 2 ⋅385054309.

It is a cyclic number.

It is not a de Polignac number, because 816801077 - 2¹⁰ = 816800053 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 816801077.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816801071) 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, 811427 + ... + 812432.

It is an arithmetic number, because the mean of its divisors is an integer number (204606360).

Almost surely, 2^816801077 is an apocalyptic number.

It is an amenable number.

816801077 is a deficient number, since it is larger than the sum of its proper divisors (1624363).

816801077 is a wasteful number, since it uses less digits than its factorization.

816801077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1624362.

The product of its (nonzero) digits is 18816, while the sum is 38.

The square root of 816801077 is about 28579.7319266644. The cubic root of 816801077 is about 934.7714377408.

The spelling of 816801077 in words is "eight hundred sixteen million, eight hundred one thousand, seventy-seven".