691198270560 has 576 divisors, whose sum is σ = 2818296778752. Its totient is φ = 150828023808.

The previous prime is 691198270541. The next prime is 691198270561. The reversal of 691198270560 is 65072891196.

691198270560 is a `hidden beast` number, since 6 + 9 + 1 + 1 + 9 + 8 + 2 + 70 + 560 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 691198270497 and 691198270506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691198270561) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 133769097 + ... + 133774263.

It is an arithmetic number, because the mean of its divisors is an integer number (4892876352).

Almost surely, 2^691198270560 is an apocalyptic number.

691198270560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 691198270560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1409148389376).

691198270560 is an abundant number, since it is smaller than the sum of its proper divisors (2127098508192).

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

691198270560 is a wasteful number, since it uses less digits than its factorization.

691198270560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5795 (or 5784 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 54.

The spelling of 691198270560 in words is "six hundred ninety-one billion, one hundred ninety-eight million, two hundred seventy thousand, five hundred sixty".