866557162242 has 54 divisors (see below), whose sum is σ = 1886249006811. Its totient is φ = 287518795200.

The previous prime is 866557162241. The next prime is 866557162279. The reversal of 866557162242 is 242261755668.

866557162242 is a `hidden beast` number, since 8 + 6 + 6 + 5 + 5 + 7 + 1 + 622 + 4 + 2 = 666.

It can be written as a sum of positive squares in 5 ways, for example, as 188617358601 + 677939803641 = 434301^2 + 823371^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=658239.

It is not an unprimeable number, because it can be changed into a prime (866557162241) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1236172492 + ... + 1236173192.

Almost surely, 2^866557162242 is an apocalyptic number.

866557162242 is an abundant number, since it is smaller than the sum of its proper divisors (1019691844569).

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

866557162242 is an frugal number, since it uses more digits than its factorization.

866557162242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2036 (or 1019 counting only the distinct ones).

The product of its digits is 9676800, while the sum is 54.

The spelling of 866557162242 in words is "eight hundred sixty-six billion, five hundred fifty-seven million, one hundred sixty-two thousand, two hundred forty-two".