1866791873 has 2 divisors, whose sum is σ = 1866791874. Its totient is φ = 1866791872.

The previous prime is 1866791867. The next prime is 1866791903. The reversal of 1866791873 is 3781976681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1350048049 + 516743824 = 36743^2 + 22732^2 .

It is a cyclic number.

It is not a de Polignac number, because 1866791873 - 2¹⁴ = 1866775489 is a prime.

It is not a weakly prime, because it can be changed into another prime (1866791813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 933395936 + 933395937.

It is an arithmetic number, because the mean of its divisors is an integer number (933395937).

Almost surely, 2^1866791873 is an apocalyptic number.

It is an amenable number.

1866791873 is a deficient number, since it is larger than the sum of its proper divisors (1).

1866791873 is an equidigital number, since it uses as much as digits as its factorization.

1866791873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3048192, while the sum is 56.

The square root of 1866791873 is about 43206.3869468392. The cubic root of 1866791873 is about 1231.3040289002.

The spelling of 1866791873 in words is "one billion, eight hundred sixty-six million, seven hundred ninety-one thousand, eight hundred seventy-three".