691081074867 has 4 divisors (see below), whose sum is σ = 921441433160. Its totient is φ = 460720716576.

The previous prime is 691081074851. The next prime is 691081074877. The reversal of 691081074867 is 768470180196.

It is a happy number.

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

It is not a de Polignac number, because 691081074867 - 2⁴ = 691081074851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (691081074877) 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, 115180179142 + ... + 115180179147.

It is an arithmetic number, because the mean of its divisors is an integer number (230360358290).

Almost surely, 2^691081074867 is an apocalyptic number.

691081074867 is a deficient number, since it is larger than the sum of its proper divisors (230360358293).

691081074867 is a wasteful number, since it uses less digits than its factorization.

691081074867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230360358292.

The product of its (nonzero) digits is 4064256, while the sum is 57.

The spelling of 691081074867 in words is "six hundred ninety-one billion, eighty-one million, seventy-four thousand, eight hundred sixty-seven".