891861862745 has 12 divisors (see below), whose sum is σ = 1244966355684. Its totient is φ = 611562420000.

The previous prime is 891861862643. The next prime is 891861862757. The reversal of 891861862745 is 547268168198.

891861862745 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 293949393241 + 597912469504 = 542171^2 + 773248^2 .

It is not a de Polignac number, because 891861862745 - 2¹⁴ = 891861846361 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1820126006 + ... + 1820126495.

It is an arithmetic number, because the mean of its divisors is an integer number (103747196307).

Almost surely, 2^891861862745 is an apocalyptic number.

It is an amenable number.

891861862745 is a deficient number, since it is larger than the sum of its proper divisors (353104492939).

891861862745 is a wasteful number, since it uses less digits than its factorization.

891861862745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3640252520 (or 3640252513 counting only the distinct ones).

The product of its digits is 46448640, while the sum is 65.

The spelling of 891861862745 in words is "eight hundred ninety-one billion, eight hundred sixty-one million, eight hundred sixty-two thousand, seven hundred forty-five".