691920006923 has 4 divisors (see below), whose sum is σ = 692043990288. Its totient is φ = 691796023560.

The previous prime is 691920006919. The next prime is 691920006941. The reversal of 691920006923 is 329600029196.

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

It is a cyclic number.

It is not a de Polignac number, because 691920006923 - 2² = 691920006919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (691920006523) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 61983311 + ... + 61994472.

It is an arithmetic number, because the mean of its divisors is an integer number (173010997572).

Almost surely, 2^691920006923 is an apocalyptic number.

691920006923 is a deficient number, since it is larger than the sum of its proper divisors (123983365).

691920006923 is a wasteful number, since it uses less digits than its factorization.

691920006923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123983364.

The product of its (nonzero) digits is 314928, while the sum is 47.

The spelling of 691920006923 in words is "six hundred ninety-one billion, nine hundred twenty million, six thousand, nine hundred twenty-three".