691489244560 has 40 divisors (see below), whose sum is σ = 1607901447096. Its totient is φ = 276563189760.

The previous prime is 691489244557. The next prime is 691489244569. The reversal of 691489244560 is 65442984196.

It is a happy number.

691489244560 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 622402704 + 690866841856 = 24948^2 + 831184^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 691489244495 and 691489244504.

It is not an unprimeable number, because it can be changed into a prime (691489244569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182832 + ... + 1190128.

Almost surely, 2^691489244560 is an apocalyptic number.

It is an amenable number.

691489244560 is an abundant number, since it is smaller than the sum of its proper divisors (916412202536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

691489244560 is a wasteful number, since it uses less digits than its factorization.

691489244560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015891 (or 1015885 counting only the distinct ones).

The product of its (nonzero) digits is 14929920, while the sum is 58.

The spelling of 691489244560 in words is "six hundred ninety-one billion, four hundred eighty-nine million, two hundred forty-four thousand, five hundred sixty".