1866723721922 has 4 divisors (see below), whose sum is σ = 2800085582886. Its totient is φ = 933361860960.

The previous prime is 1866723721921. The next prime is 1866723721927. The reversal of 1866723721922 is 2291273276681.

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

It can be written as a sum of positive squares in only one way, i.e., 993771728161 + 872951993761 = 996881^2 + 934319^2 .

It is not an unprimeable number, because it can be changed into a prime (1866723721921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 466680930479 + ... + 466680930482.

Almost surely, 2^{1866723721922} is an apocalyptic number.

1866723721922 is a deficient number, since it is larger than the sum of its proper divisors (933361860964).

1866723721922 is an equidigital number, since it uses as much as digits as its factorization.

1866723721922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933361860963.

The product of its digits is 6096384, while the sum is 56.

The spelling of 1866723721922 in words is "one trillion, eight hundred sixty-six billion, seven hundred twenty-three million, seven hundred twenty-one thousand, nine hundred twenty-two".