1861072663 has 2 divisors, whose sum is σ = 1861072664. Its totient is φ = 1861072662.

The previous prime is 1861072643. The next prime is 1861072691. The reversal of 1861072663 is 3662701681.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1861072663 - 2⁹ = 1861072151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1861072643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 930536331 + 930536332.

It is an arithmetic number, because the mean of its divisors is an integer number (930536332).

Almost surely, 2^1861072663 is an apocalyptic number.

1861072663 is a deficient number, since it is larger than the sum of its proper divisors (1).

1861072663 is an equidigital number, since it uses as much as digits as its factorization.

1861072663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 1861072663 is about 43140.1514021451. The cubic root of 1861072663 is about 1230.0453115262.

The spelling of 1861072663 in words is "one billion, eight hundred sixty-one million, seventy-two thousand, six hundred sixty-three".