816876528506 has 4 divisors (see below), whose sum is σ = 1225314792762. Its totient is φ = 408438264252.

The previous prime is 816876528493. The next prime is 816876528563. The reversal of 816876528506 is 605825678618.

It is a happy number.

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., 760922991481 + 55953537025 = 872309^2 + 236545^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204219132125 + ... + 204219132128.

Almost surely, 2^816876528506 is an apocalyptic number.

816876528506 is a deficient number, since it is larger than the sum of its proper divisors (408438264256).

816876528506 is a wasteful number, since it uses less digits than its factorization.

816876528506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408438264255.

The product of its (nonzero) digits is 38707200, while the sum is 62.

The spelling of 816876528506 in words is "eight hundred sixteen billion, eight hundred seventy-six million, five hundred twenty-eight thousand, five hundred six".