42783954561671 has 2 divisors, whose sum is σ = 42783954561672. Its totient is φ = 42783954561670.

The previous prime is 42783954561613. The next prime is 42783954561679. The reversal of 42783954561671 is 17616545938724.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42783954561671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42783954561679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21391977280835 + 21391977280836.

It is an arithmetic number, because the mean of its divisors is an integer number (21391977280836).

Almost surely, 2^{42783954561671} is an apocalyptic number.

42783954561671 is a deficient number, since it is larger than the sum of its proper divisors (1).

42783954561671 is an equidigital number, since it uses as much as digits as its factorization.

42783954561671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 304819200, while the sum is 68.

The spelling of 42783954561671 in words is "forty-two trillion, seven hundred eighty-three billion, nine hundred fifty-four million, five hundred sixty-one thousand, six hundred seventy-one".