816659995 has 16 divisors (see below), whose sum is σ = 1043172000. Its totient is φ = 611981568.

The previous prime is 816659993. The next prime is 816660067. The reversal of 816659995 is 599956618.

It is a cyclic number.

It is not a de Polignac number, because 816659995 - 2¹ = 816659993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (816659993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39840 + ... + 56749.

It is an arithmetic number, because the mean of its divisors is an integer number (65198250).

Almost surely, 2^816659995 is an apocalyptic number.

816659995 is a deficient number, since it is larger than the sum of its proper divisors (226512005).

816659995 is a wasteful number, since it uses less digits than its factorization.

816659995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96702.

The product of its digits is 5248800, while the sum is 58.

The square root of 816659995 is about 28577.2636023815. The cubic root of 816659995 is about 934.7176151633.

The spelling of 816659995 in words is "eight hundred sixteen million, six hundred fifty-nine thousand, nine hundred ninety-five".