691713631055 has 4 divisors (see below), whose sum is σ = 830056357272. Its totient is φ = 553370904840.

The previous prime is 691713631009. The next prime is 691713631061. The reversal of 691713631055 is 550136317196.

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

It is not a de Polignac number, because 691713631055 - 2³⁶ = 622994154319 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69171363101 + ... + 69171363110.

It is an arithmetic number, because the mean of its divisors is an integer number (207514089318).

Almost surely, 2^691713631055 is an apocalyptic number.

691713631055 is a deficient number, since it is larger than the sum of its proper divisors (138342726217).

691713631055 is a wasteful number, since it uses less digits than its factorization.

691713631055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138342726216.

The product of its (nonzero) digits is 510300, while the sum is 47.

The spelling of 691713631055 in words is "six hundred ninety-one billion, seven hundred thirteen million, six hundred thirty-one thousand, fifty-five".