899454972816 has 135 divisors (see below), whose sum is σ = 2674582143571. Its totient is φ = 282121254912.

The previous prime is 899454972743. The next prime is 899454972839. The reversal of 899454972816 is 618279454998.

The square root of 899454972816 is 948396.

It is a perfect power (a square), and thus also a powerful number.

899454972816 is a `hidden beast` number, since 8 + 9 + 9 + 4 + 549 + 72 + 8 + 1 + 6 = 666.

899454972816 is digitally balanced in base 2 and base 4, because in such bases 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 581467251600 + 317987721216 = 762540^2 + 563904^2 .

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 193470460 + ... + 193475108.

Almost surely, 2^899454972816 is an apocalyptic number.

899454972816 is the 948396-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 899454972816

899454972816 is an abundant number, since it is smaller than the sum of its proper divisors (1775127170755).

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

899454972816 is an equidigital number, since it uses as much as digits as its factorization.

899454972816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9346 (or 4671 counting only the distinct ones).

The product of its digits is 313528320, while the sum is 72.

The spelling of 899454972816 in words is "eight hundred ninety-nine billion, four hundred fifty-four million, nine hundred seventy-two thousand, eight hundred sixteen".