691147445201137 has 4 divisors (see below), whose sum is σ = 691149909052656. Its totient is φ = 691144981349620.

The previous prime is 691147445201089. The next prime is 691147445201153. The reversal of 691147445201137 is 731102544741196.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 691147445201137 - 2⁴³ = 682351352178929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (691147445201537) 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, 1231504939 + ... + 1232066032.

It is an arithmetic number, because the mean of its divisors is an integer number (172787477263164).

Almost surely, 2^{691147445201137} is an apocalyptic number.

It is an amenable number.

691147445201137 is a deficient number, since it is larger than the sum of its proper divisors (2463851519).

691147445201137 is a wasteful number, since it uses less digits than its factorization.

691147445201137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2463851518.

The product of its (nonzero) digits is 5080320, while the sum is 55.

The spelling of 691147445201137 in words is "six hundred ninety-one trillion, one hundred forty-seven billion, four hundred forty-five million, two hundred one thousand, one hundred thirty-seven".