1649987396843 has 2 divisors, whose sum is σ = 1649987396844. Its totient is φ = 1649987396842.

The previous prime is 1649987396791. The next prime is 1649987396867. The reversal of 1649987396843 is 3486937899461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1649987396843 - 2³⁶ = 1581267920107 is a prime.

It is not a weakly prime, because it can be changed into another prime (1649987336843) 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, 824993698421 + 824993698422.

It is an arithmetic number, because the mean of its divisors is an integer number (824993698422).

Almost surely, 2^{1649987396843} is an apocalyptic number.

1649987396843 is a deficient number, since it is larger than the sum of its proper divisors (1).

1649987396843 is an equidigital number, since it uses as much as digits as its factorization.

1649987396843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1693052928, while the sum is 77.

The spelling of 1649987396843 in words is "one trillion, six hundred forty-nine billion, nine hundred eighty-seven million, three hundred ninety-six thousand, eight hundred forty-three".