691319440630 has 128 divisors (see below), whose sum is σ = 1557040859136. Its totient is φ = 215163648000.

The previous prime is 691319440597. The next prime is 691319440631. The reversal of 691319440630 is 36044913196.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691319440631) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 25895269 + ... + 25921951.

It is an arithmetic number, because the mean of its divisors is an integer number (12164381712).

Almost surely, 2^691319440630 is an apocalyptic number.

691319440630 is an abundant number, since it is smaller than the sum of its proper divisors (865721418506).

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

691319440630 is a wasteful number, since it uses less digits than its factorization.

691319440630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27182.

The product of its (nonzero) digits is 419904, while the sum is 46.

The spelling of 691319440630 in words is "six hundred ninety-one billion, three hundred nineteen million, four hundred forty thousand, six hundred thirty".