743935137721 has 2 divisors, whose sum is σ = 743935137722. Its totient is φ = 743935137720.

The previous prime is 743935137703. The next prime is 743935137791. The reversal of 743935137721 is 127731539347.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 640582532496 + 103352605225 = 800364^2 + 321485^2 .

It is a cyclic number.

It is not a de Polignac number, because 743935137721 - 2¹¹ = 743935135673 is a prime.

It is not a weakly prime, because it can be changed into another prime (743935137791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 371967568860 + 371967568861.

It is an arithmetic number, because the mean of its divisors is an integer number (371967568861).

Almost surely, 2^743935137721 is an apocalyptic number.

It is an amenable number.

743935137721 is a deficient number, since it is larger than the sum of its proper divisors (1).

743935137721 is an equidigital number, since it uses as much as digits as its factorization.

743935137721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3333960, while the sum is 52.

The spelling of 743935137721 in words is "seven hundred forty-three billion, nine hundred thirty-five million, one hundred thirty-seven thousand, seven hundred twenty-one".