1866666702021 has 32 divisors (see below), whose sum is σ = 2847881659392. Its totient is φ = 1076518671360.

The previous prime is 1866666702013. The next prime is 1866666702053. The reversal of 1866666702021 is 1202076666681.

It is not a de Polignac number, because 1866666702021 - 2³ = 1866666702013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866666702001) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 6224955 + ... + 6517928.

It is an arithmetic number, because the mean of its divisors is an integer number (88996301856).

Almost surely, 2^{1866666702021} is an apocalyptic number.

1866666702021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1866666702021 is a deficient number, since it is larger than the sum of its proper divisors (981214957371).

1866666702021 is a wasteful number, since it uses less digits than its factorization.

1866666702021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12743113.

The product of its (nonzero) digits is 1741824, while the sum is 51.

The spelling of 1866666702021 in words is "one trillion, eight hundred sixty-six billion, six hundred sixty-six million, seven hundred two thousand, twenty-one".