899721805108 has 18 divisors (see below), whose sum is σ = 1831576532226. Its totient is φ = 385595059248.

The previous prime is 899721805093. The next prime is 899721805127. The reversal of 899721805108 is 801508127998.

It can be written as a sum of positive squares in only one way, i.e., 515368923664 + 384352881444 = 717892^2 + 619962^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2295208491 + ... + 2295208882.

Almost surely, 2^899721805108 is an apocalyptic number.

It is an amenable number.

899721805108 is an abundant number, since it is smaller than the sum of its proper divisors (931854727118).

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

899721805108 is a wasteful number, since it uses less digits than its factorization.

899721805108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4590417391 (or 4590417382 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 58.

The spelling of 899721805108 in words is "eight hundred ninety-nine billion, seven hundred twenty-one million, eight hundred five thousand, one hundred eight".