691042904836 has 48 divisors (see below), whose sum is σ = 1283621275440. Its totient is φ = 324941281280.

The previous prime is 691042904809. The next prime is 691042904911. The reversal of 691042904836 is 638409240196.

It can be written as a sum of positive squares in 8 ways, for example, as 387000944836 + 304041960000 = 622094^2 + 551400^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2816706 + ... + 3052198.

It is an arithmetic number, because the mean of its divisors is an integer number (26742109905).

Almost surely, 2^691042904836 is an apocalyptic number.

It is an amenable number.

691042904836 is a deficient number, since it is larger than the sum of its proper divisors (592578370604).

691042904836 is a wasteful number, since it uses less digits than its factorization.

691042904836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236184 (or 236182 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 52.

The spelling of 691042904836 in words is "six hundred ninety-one billion, forty-two million, nine hundred four thousand, eight hundred thirty-six".