1866271373899 has 2 divisors, whose sum is σ = 1866271373900. Its totient is φ = 1866271373898.

The previous prime is 1866271373849. The next prime is 1866271373909. The reversal of 1866271373899 is 9983731726681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1866271373899 - 2¹⁵ = 1866271341131 is a prime.

It is a super-2 number, since 2×1866271373899² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1866271373809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 933135686949 + 933135686950.

It is an arithmetic number, because the mean of its divisors is an integer number (933135686950).

Almost surely, 2^{1866271373899} is an apocalyptic number.

1866271373899 is a deficient number, since it is larger than the sum of its proper divisors (1).

1866271373899 is an equidigital number, since it uses as much as digits as its factorization.

1866271373899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 164602368, while the sum is 70.

The spelling of 1866271373899 in words is "one trillion, eight hundred sixty-six billion, two hundred seventy-one million, three hundred seventy-three thousand, eight hundred ninety-nine".