72366153721 has 2 divisors, whose sum is σ = 72366153722. Its totient is φ = 72366153720.

The previous prime is 72366153641. The next prime is 72366153733. The reversal of 72366153721 is 12735166327.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40455690496 + 31910463225 = 201136^2 + 178635^2 .

It is a cyclic number.

It is not a de Polignac number, because 72366153721 - 2¹⁷ = 72366022649 is a prime.

It is not a weakly prime, because it can be changed into another prime (72363153721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36183076860 + 36183076861.

It is an arithmetic number, because the mean of its divisors is an integer number (36183076861).

Almost surely, 2^72366153721 is an apocalyptic number.

It is an amenable number.

72366153721 is a deficient number, since it is larger than the sum of its proper divisors (1).

72366153721 is an equidigital number, since it uses as much as digits as its factorization.

72366153721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 317520, while the sum is 43.

The spelling of 72366153721 in words is "seventy-two billion, three hundred sixty-six million, one hundred fifty-three thousand, seven hundred twenty-one".