1421666218856 has 32 divisors (see below), whose sum is σ = 2969660874600. Its totient is φ = 633527650560.

The previous prime is 1421666218781. The next prime is 1421666218891. The reversal of 1421666218856 is 6588126661241.

It can be written as a sum of positive squares in 4 ways, for example, as 998820348100 + 422845870756 = 999410^2 + 650266^2 .

It is a super-2 number, since 2×1421666218856² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 235684355 + ... + 235690386.

Almost surely, 2^{1421666218856} is an apocalyptic number.

It is an amenable number.

1421666218856 is an abundant number, since it is smaller than the sum of its proper divisors (1547994655744).

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

1421666218856 is a wasteful number, since it uses less digits than its factorization.

1421666218856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471374789 (or 471374785 counting only the distinct ones).

The product of its digits is 6635520, while the sum is 56.

The spelling of 1421666218856 in words is "one trillion, four hundred twenty-one billion, six hundred sixty-six million, two hundred eighteen thousand, eight hundred fifty-six".