1851398356793 has 2 divisors, whose sum is σ = 1851398356794. Its totient is φ = 1851398356792.

The previous prime is 1851398356789. The next prime is 1851398356807. The reversal of 1851398356793 is 3976538931581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1092917612329 + 758480744464 = 1045427^2 + 870908^2 .

It is a cyclic number.

It is not a de Polignac number, because 1851398356793 - 2² = 1851398356789 is a prime.

It is not a weakly prime, because it can be changed into another prime (1851398356733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 925699178396 + 925699178397.

It is an arithmetic number, because the mean of its divisors is an integer number (925699178397).

Almost surely, 2^{1851398356793} is an apocalyptic number.

It is an amenable number.

1851398356793 is a deficient number, since it is larger than the sum of its proper divisors (1).

1851398356793 is an equidigital number, since it uses as much as digits as its factorization.

1851398356793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 146966400, while the sum is 68.

The spelling of 1851398356793 in words is "one trillion, eight hundred fifty-one billion, three hundred ninety-eight million, three hundred fifty-six thousand, seven hundred ninety-three".