691105019008 has 32 divisors (see below), whose sum is σ = 1424287021500. Its totient is φ = 333636903936.

The previous prime is 691105018957. The next prime is 691105019023. The reversal of 691105019008 is 800910501196.

It can be written as a sum of positive squares in 2 ways, for example, as 613013834304 + 78091184704 = 782952^2 + 279448^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×691105019008² (a number of 24 digits) contains 22 as substring.

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, 93086943 + ... + 93094366.

Almost surely, 2^691105019008 is an apocalyptic number.

It is an amenable number.

691105019008 is an abundant number, since it is smaller than the sum of its proper divisors (733182002492).

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

691105019008 is a wasteful number, since it uses less digits than its factorization.

691105019008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186181352 (or 186181340 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 40.

The spelling of 691105019008 in words is "six hundred ninety-one billion, one hundred five million, nineteen thousand, eight".