1866196281 has 4 divisors (see below), whose sum is σ = 2488261712. Its totient is φ = 1244130852.

The previous prime is 1866196279. The next prime is 1866196331. The reversal of 1866196281 is 1826916681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1826916681 = 3 ⋅608972227.

It is not a de Polignac number, because 1866196281 - 2¹ = 1866196279 is a prime.

It is a super-2 number, since 2×1866196281² = 6965377118436461922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1866196281.

It is not an unprimeable number, because it can be changed into a prime (1866196201) 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, 311032711 + ... + 311032716.

It is an arithmetic number, because the mean of its divisors is an integer number (622065428).

Almost surely, 2^1866196281 is an apocalyptic number.

It is an amenable number.

1866196281 is a deficient number, since it is larger than the sum of its proper divisors (622065431).

1866196281 is an equidigital number, since it uses as much as digits as its factorization.

1866196281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622065430.

The product of its digits is 248832, while the sum is 48.

The square root of 1866196281 is about 43199.4939900921. The cubic root of 1866196281 is about 1231.1730675354.

The spelling of 1866196281 in words is "one billion, eight hundred sixty-six million, one hundred ninety-six thousand, two hundred eighty-one".