691723753983 has 6 divisors (see below), whose sum is σ = 999156533544. Its totient is φ = 461149169316.

The previous prime is 691723753961. The next prime is 691723753997. The reversal of 691723753983 is 389357327196.

691723753983 is a `hidden beast` number, since 6 + 9 + 1 + 7 + 237 + 5 + 398 + 3 = 666.

It is not a de Polignac number, because 691723753983 - 2¹² = 691723749887 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 691723753983.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691723753933) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38429097435 + ... + 38429097452.

It is an arithmetic number, because the mean of its divisors is an integer number (166526088924).

Almost surely, 2^691723753983 is an apocalyptic number.

691723753983 is a deficient number, since it is larger than the sum of its proper divisors (307432779561).

691723753983 is a wasteful number, since it uses less digits than its factorization.

691723753983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76858194893 (or 76858194890 counting only the distinct ones).

The product of its digits is 51438240, while the sum is 63.

The spelling of 691723753983 in words is "six hundred ninety-one billion, seven hundred twenty-three million, seven hundred fifty-three thousand, nine hundred eighty-three".