72644052647171 has 2 divisors, whose sum is σ = 72644052647172. Its totient is φ = 72644052647170.

The previous prime is 72644052647119. The next prime is 72644052647189. The reversal of 72644052647171 is 17174625044627.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72644052647171 - 2¹⁸ = 72644052385027 is a prime.

It is a super-2 number, since 2×72644052647171² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72644052647671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36322026323585 + 36322026323586.

It is an arithmetic number, because the mean of its divisors is an integer number (36322026323586).

Almost surely, 2^{72644052647171} is an apocalyptic number.

72644052647171 is a deficient number, since it is larger than the sum of its proper divisors (1).

72644052647171 is an equidigital number, since it uses as much as digits as its factorization.

72644052647171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15805440, while the sum is 56.

The spelling of 72644052647171 in words is "seventy-two trillion, six hundred forty-four billion, fifty-two million, six hundred forty-seven thousand, one hundred seventy-one".