691104221380 has 24 divisors (see below), whose sum is σ = 1454551219800. Its totient is φ = 275826001920.

The previous prime is 691104221371. The next prime is 691104221407. The reversal of 691104221380 is 83122401196.

It can be written as a sum of positive squares in 4 ways, for example, as 164237288644 + 526866932736 = 405262^2 + 725856^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38471211 + ... + 38489170.

It is an arithmetic number, because the mean of its divisors is an integer number (60606300825).

Almost surely, 2^691104221380 is an apocalyptic number.

It is an amenable number.

691104221380 is an abundant number, since it is smaller than the sum of its proper divisors (763446998420).

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

691104221380 is a wasteful number, since it uses less digits than its factorization.

691104221380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76960839 (or 76960837 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The spelling of 691104221380 in words is "six hundred ninety-one billion, one hundred four million, two hundred twenty-one thousand, three hundred eighty".