1642728371723 has 2 divisors, whose sum is σ = 1642728371724. Its totient is φ = 1642728371722.

The previous prime is 1642728371693. The next prime is 1642728371741. The reversal of 1642728371723 is 3271738272461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1642728371723 - 2¹² = 1642728367627 is a prime.

It is not a weakly prime, because it can be changed into another prime (1642728371743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821364185861 + 821364185862.

It is an arithmetic number, because the mean of its divisors is an integer number (821364185862).

Almost surely, 2^{1642728371723} is an apocalyptic number.

1642728371723 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642728371723 is an equidigital number, since it uses as much as digits as its factorization.

1642728371723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4741632, while the sum is 53.

The spelling of 1642728371723 in words is "one trillion, six hundred forty-two billion, seven hundred twenty-eight million, three hundred seventy-one thousand, seven hundred twenty-three".