6561495894222 has 24 divisors (see below), whose sum is σ = 14220354582720. Its totient is φ = 2186583737280.

The previous prime is 6561495894221. The next prime is 6561495894299. The reversal of 6561495894222 is 2224985941656.

6561495894222 is a `hidden beast` number, since 6 + 5 + 6 + 1 + 4 + 9 + 589 + 42 + 2 + 2 = 666.

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 6561495894222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6561495894221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48393822 + ... + 48529217.

It is an arithmetic number, because the mean of its divisors is an integer number (592514774280).

Almost surely, 2^{6561495894222} is an apocalyptic number.

6561495894222 is an abundant number, since it is smaller than the sum of its proper divisors (7658858688498).

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

6561495894222 is a wasteful number, since it uses less digits than its factorization.

6561495894222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96926808 (or 96926805 counting only the distinct ones).

The product of its digits is 74649600, while the sum is 63.

The spelling of 6561495894222 in words is "six trillion, five hundred sixty-one billion, four hundred ninety-five million, eight hundred ninety-four thousand, two hundred twenty-two".