1866791963 has 2 divisors, whose sum is σ = 1866791964. Its totient is φ = 1866791962.

The previous prime is 1866791957. The next prime is 1866791977. The reversal of 1866791963 is 3691976681.

It is a weak prime.

It is an emirp because it is prime and its reverse (3691976681) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1866791963 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1866791899 and 1866791908.

It is not a weakly prime, because it can be changed into another prime (1866791903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 933395981 + 933395982.

It is an arithmetic number, because the mean of its divisors is an integer number (933395982).

Almost surely, 2^1866791963 is an apocalyptic number.

1866791963 is a deficient number, since it is larger than the sum of its proper divisors (1).

1866791963 is an equidigital number, since it uses as much as digits as its factorization.

1866791963 is an evil number, because the sum of its binary digits is even.

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

The square root of 1866791963 is about 43206.3879883519. The cubic root of 1866791963 is about 1231.3040486877.

The spelling of 1866791963 in words is "one billion, eight hundred sixty-six million, seven hundred ninety-one thousand, nine hundred sixty-three".