891155220512 has 54 divisors (see below), whose sum is σ = 1771862813469. Its totient is φ = 441201375360.

The previous prime is 891155220379. The next prime is 891155220581. The reversal of 891155220512 is 215022551198.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 855114476176 + 36040744336 = 924724^2 + 189844^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=667516.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 891155220512.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 582073187 + ... + 582074717.

Almost surely, 2^891155220512 is an apocalyptic number.

It is an amenable number.

891155220512 is a deficient number, since it is larger than the sum of its proper divisors (880707592957).

891155220512 is an frugal number, since it uses more digits than its factorization.

891155220512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3290 (or 1642 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 41.

The spelling of 891155220512 in words is "eight hundred ninety-one billion, one hundred fifty-five million, two hundred twenty thousand, five hundred twelve".