73221663413 has 2 divisors, whose sum is σ = 73221663414. Its totient is φ = 73221663412.

The previous prime is 73221663353. The next prime is 73221663457. The reversal of 73221663413 is 31436612237.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52433214289 + 20788449124 = 228983^2 + 144182^2 .

It is a cyclic number.

It is not a de Polignac number, because 73221663413 - 2⁸ = 73221663157 is a prime.

It is a super-2 number, since 2×73221663413² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73221663913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36610831706 + 36610831707.

It is an arithmetic number, because the mean of its divisors is an integer number (36610831707).

Almost surely, 2^73221663413 is an apocalyptic number.

It is an amenable number.

73221663413 is a deficient number, since it is larger than the sum of its proper divisors (1).

73221663413 is an equidigital number, since it uses as much as digits as its factorization.

73221663413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 38.

The spelling of 73221663413 in words is "seventy-three billion, two hundred twenty-one million, six hundred sixty-three thousand, four hundred thirteen".