1866700366856 has 16 divisors (see below), whose sum is σ = 3769298817900. Its totient is φ = 861554015424.

The previous prime is 1866700366841. The next prime is 1866700366903. The reversal of 1866700366856 is 6586630076681.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1297626269956 + 569074096900 = 1139134^2 + 754370^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8974520891 + ... + 8974521098.

Almost surely, 2^{1866700366856} is an apocalyptic number.

It is an amenable number.

1866700366856 is an abundant number, since it is smaller than the sum of its proper divisors (1902598451044).

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

1866700366856 is a wasteful number, since it uses less digits than its factorization.

1866700366856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17949042008 (or 17949042004 counting only the distinct ones).

The product of its (nonzero) digits is 52254720, while the sum is 62.

The spelling of 1866700366856 in words is "one trillion, eight hundred sixty-six billion, seven hundred million, three hundred sixty-six thousand, eight hundred fifty-six".