72535625221 has 2 divisors, whose sum is σ = 72535625222. Its totient is φ = 72535625220.

The previous prime is 72535625189. The next prime is 72535625257. The reversal of 72535625221 is 12252653527.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51308592196 + 21227033025 = 226514^2 + 145695^2 .

It is a cyclic number.

It is not a de Polignac number, because 72535625221 - 2⁵ = 72535625189 is a prime.

It is a super-2 number, since 2×72535625221² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72535625821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36267812610 + 36267812611.

It is an arithmetic number, because the mean of its divisors is an integer number (36267812611).

Almost surely, 2^72535625221 is an apocalyptic number.

It is an amenable number.

72535625221 is a deficient number, since it is larger than the sum of its proper divisors (1).

72535625221 is an equidigital number, since it uses as much as digits as its factorization.

72535625221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 252000, while the sum is 40.

The spelling of 72535625221 in words is "seventy-two billion, five hundred thirty-five million, six hundred twenty-five thousand, two hundred twenty-one".