691220084406 has 16 divisors (see below), whose sum is σ = 1382845261104. Its totient is φ = 230339179424.

The previous prime is 691220084393. The next prime is 691220084431. The reversal of 691220084406 is 604480022196.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16856661 + ... + 16897616.

It is an arithmetic number, because the mean of its divisors is an integer number (86427828819).

Almost surely, 2^691220084406 is an apocalyptic number.

691220084406 is an abundant number, since it is smaller than the sum of its proper divisors (691625176698).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

691220084406 is a wasteful number, since it uses less digits than its factorization.

691220084406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33757695.

The product of its (nonzero) digits is 165888, while the sum is 42.

The spelling of 691220084406 in words is "six hundred ninety-one billion, two hundred twenty million, eighty-four thousand, four hundred six".