73649405509 has 2 divisors, whose sum is σ = 73649405510. Its totient is φ = 73649405508.

The previous prime is 73649405503. The next prime is 73649405521. The reversal of 73649405509 is 90550494637.

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., 53830960225 + 19818445284 = 232015^2 + 140778^2 .

It is an emirp because it is prime and its reverse (90550494637) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73649405509 - 2²³ = 73641016901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73649405503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36824702754 + 36824702755.

It is an arithmetic number, because the mean of its divisors is an integer number (36824702755).

Almost surely, 2^73649405509 is an apocalyptic number.

It is an amenable number.

73649405509 is a deficient number, since it is larger than the sum of its proper divisors (1).

73649405509 is an equidigital number, since it uses as much as digits as its factorization.

73649405509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4082400, while the sum is 52.

The spelling of 73649405509 in words is "seventy-three billion, six hundred forty-nine million, four hundred five thousand, five hundred nine".