72051526321 has 2 divisors, whose sum is σ = 72051526322. Its totient is φ = 72051526320.

The previous prime is 72051526297. The next prime is 72051526373. The reversal of 72051526321 is 12362515027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64627808400 + 7423717921 = 254220^2 + 86161^2 .

It is a cyclic number.

It is not a de Polignac number, because 72051526321 - 2⁷ = 72051526193 is a prime.

It is not a weakly prime, because it can be changed into another prime (72051526021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36025763160 + 36025763161.

It is an arithmetic number, because the mean of its divisors is an integer number (36025763161).

Almost surely, 2^72051526321 is an apocalyptic number.

It is an amenable number.

72051526321 is a deficient number, since it is larger than the sum of its proper divisors (1).

72051526321 is an equidigital number, since it uses as much as digits as its factorization.

72051526321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25200, while the sum is 34.

The spelling of 72051526321 in words is "seventy-two billion, fifty-one million, five hundred twenty-six thousand, three hundred twenty-one".