1866342551 has 2 divisors, whose sum is σ = 1866342552. Its totient is φ = 1866342550.

The previous prime is 1866342523. The next prime is 1866342559. The reversal of 1866342551 is 1552436681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1866342551 - 2³⁰ = 792600727 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1866342499 and 1866342508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1866342559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 933171275 + 933171276.

It is an arithmetic number, because the mean of its divisors is an integer number (933171276).

Almost surely, 2^1866342551 is an apocalyptic number.

1866342551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1866342551 is an equidigital number, since it uses as much as digits as its factorization.

1866342551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172800, while the sum is 41.

The square root of 1866342551 is about 43201.1869165652. The cubic root of 1866342551 is about 1231.2052326015.

The spelling of 1866342551 in words is "one billion, eight hundred sixty-six million, three hundred forty-two thousand, five hundred fifty-one".