73640371393 has 2 divisors, whose sum is σ = 73640371394. Its totient is φ = 73640371392.

The previous prime is 73640371373. The next prime is 73640371397. The reversal of 73640371393 is 39317304637.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41228490304 + 32411881089 = 203048^2 + 180033^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73640371393 is a prime.

It is not a weakly prime, because it can be changed into another prime (73640371397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36820185696 + 36820185697.

It is an arithmetic number, because the mean of its divisors is an integer number (36820185697).

Almost surely, 2^73640371393 is an apocalyptic number.

It is an amenable number.

73640371393 is a deficient number, since it is larger than the sum of its proper divisors (1).

73640371393 is an equidigital number, since it uses as much as digits as its factorization.

73640371393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 857304, while the sum is 46.

The spelling of 73640371393 in words is "seventy-three billion, six hundred forty million, three hundred seventy-one thousand, three hundred ninety-three".