1861237432643 has 2 divisors, whose sum is σ = 1861237432644. Its totient is φ = 1861237432642.

The previous prime is 1861237432631. The next prime is 1861237432723. The reversal of 1861237432643 is 3462347321681.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1861237432643 - 2³² = 1856942465347 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1861237432591 and 1861237432600.

It is not a weakly prime, because it can be changed into another prime (1861237432343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 930618716321 + 930618716322.

It is an arithmetic number, because the mean of its divisors is an integer number (930618716322).

Almost surely, 2^{1861237432643} is an apocalyptic number.

1861237432643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1861237432643 is an equidigital number, since it uses as much as digits as its factorization.

1861237432643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3483648, while the sum is 50.

The spelling of 1861237432643 in words is "one trillion, eight hundred sixty-one billion, two hundred thirty-seven million, four hundred thirty-two thousand, six hundred forty-three".