72354325661 has 2 divisors, whose sum is σ = 72354325662. Its totient is φ = 72354325660.

The previous prime is 72354325621. The next prime is 72354325709. The reversal of 72354325661 is 16652345327.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42664968025 + 29689357636 = 206555^2 + 172306^2 .

It is a cyclic number.

It is not a de Polignac number, because 72354325661 - 2¹⁴ = 72354309277 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72354325601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36177162830 + 36177162831.

It is an arithmetic number, because the mean of its divisors is an integer number (36177162831).

Almost surely, 2^72354325661 is an apocalyptic number.

It is an amenable number.

72354325661 is a deficient number, since it is larger than the sum of its proper divisors (1).

72354325661 is an equidigital number, since it uses as much as digits as its factorization.

72354325661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 907200, while the sum is 44.

The spelling of 72354325661 in words is "seventy-two billion, three hundred fifty-four million, three hundred twenty-five thousand, six hundred sixty-one".