1666219266087 has 8 divisors (see below), whose sum is σ = 2221801236480. Its totient is φ = 1110725069880.

The previous prime is 1666219266067. The next prime is 1666219266113. The reversal of 1666219266087 is 7806629126661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1666219266087 - 2⁸ = 1666219265831 is a prime.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 1666219266087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666219266037) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21899239 + ... + 21975192.

It is an arithmetic number, because the mean of its divisors is an integer number (277725154560).

Almost surely, 2^{1666219266087} is an apocalyptic number.

1666219266087 is a deficient number, since it is larger than the sum of its proper divisors (555581970393).

1666219266087 is a wasteful number, since it uses less digits than its factorization.

1666219266087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43887093.

The product of its (nonzero) digits is 15676416, while the sum is 60.

The spelling of 1666219266087 in words is "one trillion, six hundred sixty-six billion, two hundred nineteen million, two hundred sixty-six thousand, eighty-seven".