691403568662 has 4 divisors (see below), whose sum is σ = 1037105352996. Its totient is φ = 345701784330.

The previous prime is 691403568659. The next prime is 691403568677. The reversal of 691403568662 is 266865304196.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 691403568598 and 691403568607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172850892164 + ... + 172850892167.

It is an arithmetic number, because the mean of its divisors is an integer number (259276338249).

Almost surely, 2^691403568662 is an apocalyptic number.

691403568662 is a deficient number, since it is larger than the sum of its proper divisors (345701784334).

691403568662 is a wasteful number, since it uses less digits than its factorization.

691403568662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345701784333.

The product of its (nonzero) digits is 11197440, while the sum is 56.

The spelling of 691403568662 in words is "six hundred ninety-one billion, four hundred three million, five hundred sixty-eight thousand, six hundred sixty-two".