816626506 has 4 divisors (see below), whose sum is σ = 1224939762. Its totient is φ = 408313252.

The previous prime is 816626471. The next prime is 816626507. The reversal of 816626506 is 605626618.

816626506 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 815616481 + 1010025 = 28559^2 + 1005^2 .

It is not an unprimeable number, because it can be changed into a prime (816626507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204156625 + ... + 204156628.

Almost surely, 2^816626506 is an apocalyptic number.

816626506 is a deficient number, since it is larger than the sum of its proper divisors (408313256).

816626506 is a wasteful number, since it uses less digits than its factorization.

816626506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408313255.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 816626506 is about 28576.6776585383. The cubic root of 816626506 is about 934.7048382483.

The spelling of 816626506 in words is "eight hundred sixteen million, six hundred twenty-six thousand, five hundred six".