1224861871842 has 36 divisors (see below), whose sum is σ = 3087151862886. Its totient is φ = 349960534560.

The previous prime is 1224861871829. The next prime is 1224861871843. The reversal of 1224861871842 is 2481781684221.

1224861871842 is a `hidden beast` number, since 1 + 2 + 2 + 4 + 8 + 618 + 7 + 18 + 4 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1056638029041 + 168223842801 = 1027929^2 + 410151^2 .

It is not an unprimeable number, because it can be changed into a prime (1224861871843) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 694365259 + ... + 694367022.

Almost surely, 2^{1224861871842} is an apocalyptic number.

1224861871842 is an abundant number, since it is smaller than the sum of its proper divisors (1862289991044).

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

1224861871842 is a wasteful number, since it uses less digits than its factorization.

1224861871842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1388732303 (or 1388732293 counting only the distinct ones).

The product of its digits is 2752512, while the sum is 54.

The spelling of 1224861871842 in words is "one trillion, two hundred twenty-four billion, eight hundred sixty-one million, eight hundred seventy-one thousand, eight hundred forty-two".