72540121447 has 2 divisors, whose sum is σ = 72540121448. Its totient is φ = 72540121446.

The previous prime is 72540121363. The next prime is 72540121453. The reversal of 72540121447 is 74412104527.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72540121447 - 2⁷ = 72540121319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72540121477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36270060723 + 36270060724.

It is an arithmetic number, because the mean of its divisors is an integer number (36270060724).

Almost surely, 2^72540121447 is an apocalyptic number.

72540121447 is a deficient number, since it is larger than the sum of its proper divisors (1).

72540121447 is an equidigital number, since it uses as much as digits as its factorization.

72540121447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62720, while the sum is 37.

The spelling of 72540121447 in words is "seventy-two billion, five hundred forty million, one hundred twenty-one thousand, four hundred forty-seven".