845490534221 has 16 divisors (see below), whose sum is σ = 867214875648. Its totient is φ = 824024275200.

The previous prime is 845490534167. The next prime is 845490534223. The reversal of 845490534221 is 122435094548.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-845490534221 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (845490534223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25673756 + ... + 25706666.

It is an arithmetic number, because the mean of its divisors is an integer number (54200929728).

Almost surely, 2^845490534221 is an apocalyptic number.

It is an amenable number.

845490534221 is a deficient number, since it is larger than the sum of its proper divisors (21724341427).

845490534221 is a wasteful number, since it uses less digits than its factorization.

845490534221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36812.

The product of its (nonzero) digits is 1382400, while the sum is 47.

The spelling of 845490534221 in words is "eight hundred forty-five billion, four hundred ninety million, five hundred thirty-four thousand, two hundred twenty-one".