73253620309 has 4 divisors (see below), whose sum is σ = 73328599404. Its totient is φ = 73178641216.

The previous prime is 73253620273. The next prime is 73253620387. The reversal of 73253620309 is 90302635237.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 48875482084 + 24378138225 = 221078^2 + 156135^2 .

It is a cyclic number.

It is not a de Polignac number, because 73253620309 - 2¹¹ = 73253618261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73253620399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37488082 + ... + 37490035.

It is an arithmetic number, because the mean of its divisors is an integer number (18332149851).

Almost surely, 2^73253620309 is an apocalyptic number.

It is an amenable number.

73253620309 is a deficient number, since it is larger than the sum of its proper divisors (74979095).

73253620309 is an equidigital number, since it uses as much as digits as its factorization.

73253620309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74979094.

The product of its (nonzero) digits is 204120, while the sum is 40.

The spelling of 73253620309 in words is "seventy-three billion, two hundred fifty-three million, six hundred twenty thousand, three hundred nine".