1866348893951 has 4 divisors (see below), whose sum is σ = 1866616785072. Its totient is φ = 1866081002832.

The previous prime is 1866348893809. The next prime is 1866348893989. The reversal of 1866348893951 is 1593988436681.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1866348893951 - 2²⁶ = 1866281785087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866348293951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133935110 + ... + 133949043.

It is an arithmetic number, because the mean of its divisors is an integer number (466654196268).

Almost surely, 2^{1866348893951} is an apocalyptic number.

1866348893951 is a deficient number, since it is larger than the sum of its proper divisors (267891121).

1866348893951 is an equidigital number, since it uses as much as digits as its factorization.

1866348893951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267891120.

The product of its digits is 268738560, while the sum is 71.

The spelling of 1866348893951 in words is "one trillion, eight hundred sixty-six billion, three hundred forty-eight million, eight hundred ninety-three thousand, nine hundred fifty-one".