816765870001 has 3 divisors (see below), whose sum is σ = 816766773753. Its totient is φ = 816764966250.

The previous prime is 816765869989. The next prime is 816765870013. The reversal of 816765870001 is 100078567618.

The square root of 816765870001 is 903751.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (816765869989) and next prime (816765870013).

It is not a de Polignac number, because 816765870001 - 2²⁵ = 816732315569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816765870071) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 451876 + ... + 1355626.

It is an arithmetic number, because the mean of its divisors is an integer number (272255591251).

Almost surely, 2^816765870001 is an apocalyptic number.

816765870001 is the 903751-st square number.

816765870001 is the 451876-th centered octagonal number.

It is an amenable number.

816765870001 is a deficient number, since it is larger than the sum of its proper divisors (903752).

816765870001 is an frugal number, since it uses more digits than its factorization.

816765870001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1807502 (or 903751 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 49.

Multiplying 816765870001 by its sum of digits (49), we get a square (40021527630049 = 6326257²).

The spelling of 816765870001 in words is "eight hundred sixteen billion, seven hundred sixty-five million, eight hundred seventy thousand, one".