691010040691 has 4 divisors (see below), whose sum is σ = 699335462952. Its totient is φ = 682684618432.

The previous prime is 691010040541. The next prime is 691010040727. The reversal of 691010040691 is 196040010196.

691010040691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 691010040691 - 2¹⁵ = 691010007923 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 691010040691.

It is not an unprimeable number, because it can be changed into a prime (691010040491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4162711006 + ... + 4162711171.

It is an arithmetic number, because the mean of its divisors is an integer number (174833865738).

Almost surely, 2^691010040691 is an apocalyptic number.

691010040691 is a deficient number, since it is larger than the sum of its proper divisors (8325422261).

691010040691 is an equidigital number, since it uses as much as digits as its factorization.

691010040691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8325422260.

The product of its (nonzero) digits is 11664, while the sum is 37.

The spelling of 691010040691 in words is "six hundred ninety-one billion, ten million, forty thousand, six hundred ninety-one".