73221275551 has 2 divisors, whose sum is σ = 73221275552. Its totient is φ = 73221275550.

The previous prime is 73221275539. The next prime is 73221275557. The reversal of 73221275551 is 15557212237.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 73221275551 - 2³³ = 64631340959 is a prime.

It is a super-2 number, since 2×73221275551² (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 (73221275557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36610637775 + 36610637776.

It is an arithmetic number, because the mean of its divisors is an integer number (36610637776).

Almost surely, 2^73221275551 is an apocalyptic number.

73221275551 is a deficient number, since it is larger than the sum of its proper divisors (1).

73221275551 is an equidigital number, since it uses as much as digits as its factorization.

73221275551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 147000, while the sum is 40.

Adding to 73221275551 its reverse (15557212237), we get a palindrome (88778487788).

The spelling of 73221275551 in words is "seventy-three billion, two hundred twenty-one million, two hundred seventy-five thousand, five hundred fifty-one".