691319440612 has 24 divisors (see below), whose sum is σ = 1214161341120. Its totient is φ = 344417048160.

The previous prime is 691319440597. The next prime is 691319440631. The reversal of 691319440612 is 216044913196.

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 7 ways as a sum of consecutive naturals, for example, 3203298 + ... + 3412294.

It is an arithmetic number, because the mean of its divisors is an integer number (50590055880).

Almost surely, 2^691319440612 is an apocalyptic number.

It is an amenable number.

691319440612 is a deficient number, since it is larger than the sum of its proper divisors (522841900508).

691319440612 is a wasteful number, since it uses less digits than its factorization.

691319440612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211971 (or 211969 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 46.

The spelling of 691319440612 in words is "six hundred ninety-one billion, three hundred nineteen million, four hundred forty thousand, six hundred twelve".