72277220740321 has 2 divisors, whose sum is σ = 72277220740322. Its totient is φ = 72277220740320.

The previous prime is 72277220740313. The next prime is 72277220740331. The reversal of 72277220740321 is 12304702277227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64536800910400 + 7740419829921 = 8033480^2 + 2782161^2 .

It is a cyclic number.

It is not a de Polignac number, because 72277220740321 - 2³ = 72277220740313 is a prime.

It is not a weakly prime, because it can be changed into another prime (72277220740301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36138610370160 + 36138610370161.

It is an arithmetic number, because the mean of its divisors is an integer number (36138610370161).

Almost surely, 2^{72277220740321} is an apocalyptic number.

It is an amenable number.

72277220740321 is a deficient number, since it is larger than the sum of its proper divisors (1).

72277220740321 is an equidigital number, since it uses as much as digits as its factorization.

72277220740321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 921984, while the sum is 46.

The spelling of 72277220740321 in words is "seventy-two trillion, two hundred seventy-seven billion, two hundred twenty million, seven hundred forty thousand, three hundred twenty-one".