816665007 has 8 divisors (see below), whose sum is σ = 1089477376. Its totient is φ = 544147992.

The previous prime is 816664993. The next prime is 816665009. The reversal of 816665007 is 700566618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 816665007 - 2¹⁹ = 816140719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816665009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67303 + ... + 78504.

It is an arithmetic number, because the mean of its divisors is an integer number (136184672).

Almost surely, 2^816665007 is an apocalyptic number.

816665007 is a deficient number, since it is larger than the sum of its proper divisors (272812369).

816665007 is a wasteful number, since it uses less digits than its factorization.

816665007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147677.

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 816665007 is about 28577.3512943380. The cubic root of 816665007 is about 934.7195273402.

The spelling of 816665007 in words is "eight hundred sixteen million, six hundred sixty-five thousand, seven".