691846601149 has 4 divisors (see below), whose sum is σ = 754741746720. Its totient is φ = 628951455580.

The previous prime is 691846601141. The next prime is 691846601189. The reversal of 691846601149 is 941106648196.

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 691846601149 - 2³ = 691846601141 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 691846601149.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691846601141) 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, 31447572769 + ... + 31447572790.

It is an arithmetic number, because the mean of its divisors is an integer number (188685436680).

Almost surely, 2^691846601149 is an apocalyptic number.

It is an amenable number.

691846601149 is a deficient number, since it is larger than the sum of its proper divisors (62895145571).

691846601149 is a wasteful number, since it uses less digits than its factorization.

691846601149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62895145570.

The product of its (nonzero) digits is 2239488, while the sum is 55.

The spelling of 691846601149 in words is "six hundred ninety-one billion, eight hundred forty-six million, six hundred one thousand, one hundred forty-nine".