1866199763 has 4 divisors (see below), whose sum is σ = 1876625640. Its totient is φ = 1855773888.

The previous prime is 1866199759. The next prime is 1866199799. The reversal of 1866199763 is 3679916681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3679916681 = 7 ⋅525702383.

It is a cyclic number.

It is not a de Polignac number, because 1866199763 - 2² = 1866199759 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1866199699 and 1866199708.

It is not an unprimeable number, because it can be changed into a prime (1866199723) 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, 5212670 + ... + 5213027.

It is an arithmetic number, because the mean of its divisors is an integer number (469156410).

Almost surely, 2^1866199763 is an apocalyptic number.

1866199763 is a deficient number, since it is larger than the sum of its proper divisors (10425877).

1866199763 is a wasteful number, since it uses less digits than its factorization.

1866199763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10425876.

The product of its digits is 2939328, while the sum is 56.

The square root of 1866199763 is about 43199.5342914712. The cubic root of 1866199763 is about 1231.1738332537.

The spelling of 1866199763 in words is "one billion, eight hundred sixty-six million, one hundred ninety-nine thousand, seven hundred sixty-three".