73254657221 has 2 divisors, whose sum is σ = 73254657222. Its totient is φ = 73254657220.

The previous prime is 73254657193. The next prime is 73254657317. The reversal of 73254657221 is 12275645237.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54144636100 + 19110021121 = 232690^2 + 138239^2 .

It is an emirp because it is prime and its reverse (12275645237) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73254657221 - 2¹⁰ = 73254656197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73254657121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36627328610 + 36627328611.

It is an arithmetic number, because the mean of its divisors is an integer number (36627328611).

Almost surely, 2^73254657221 is an apocalyptic number.

It is an amenable number.

73254657221 is a deficient number, since it is larger than the sum of its proper divisors (1).

73254657221 is an equidigital number, since it uses as much as digits as its factorization.

73254657221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 705600, while the sum is 44.

The spelling of 73254657221 in words is "seventy-three billion, two hundred fifty-four million, six hundred fifty-seven thousand, two hundred twenty-one".