816166317 has 4 divisors (see below), whose sum is σ = 1088221760. Its totient is φ = 544110876.

The previous prime is 816166303. The next prime is 816166321. The reversal of 816166317 is 713661618.

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.

It is not a de Polignac number, because 816166317 - 2¹⁶ = 816100781 is a prime.

It is a super-2 number, since 2×816166317² = 1332254914010688978, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816166367) 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, 136027717 + ... + 136027722.

It is an arithmetic number, because the mean of its divisors is an integer number (272055440).

Almost surely, 2^816166317 is an apocalyptic number.

It is an amenable number.

816166317 is a deficient number, since it is larger than the sum of its proper divisors (272055443).

816166317 is a wasteful number, since it uses less digits than its factorization.

816166317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272055442.

The product of its digits is 36288, while the sum is 39.

The square root of 816166317 is about 28568.6246956342. The cubic root of 816166317 is about 934.5292289152.

The spelling of 816166317 in words is "eight hundred sixteen million, one hundred sixty-six thousand, three hundred seventeen".