691734016138 has 32 divisors (see below), whose sum is σ = 1181251693440. Its totient is φ = 300726159360.

The previous prime is 691734016111. The next prime is 691734016153. The reversal of 691734016138 is 831610437196.

It is a junction number, because it is equal to n+sod(n) for n = 691734016091 and 691734016100.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5999206 + ... + 6113422.

It is an arithmetic number, because the mean of its divisors is an integer number (36914115420).

Almost surely, 2^691734016138 is an apocalyptic number.

691734016138 is a deficient number, since it is larger than the sum of its proper divisors (489517677302).

691734016138 is a wasteful number, since it uses less digits than its factorization.

691734016138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126222.

The product of its (nonzero) digits is 653184, while the sum is 49.

The spelling of 691734016138 in words is "six hundred ninety-one billion, seven hundred thirty-four million, sixteen thousand, one hundred thirty-eight".