72540753373447 has 2 divisors, whose sum is σ = 72540753373448. Its totient is φ = 72540753373446.

The previous prime is 72540753373303. The next prime is 72540753373453. The reversal of 72540753373447 is 74437335704527.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72540753373447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72540753373747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36270376686723 + 36270376686724.

It is an arithmetic number, because the mean of its divisors is an integer number (36270376686724).

Almost surely, 2^{72540753373447} is an apocalyptic number.

72540753373447 is a deficient number, since it is larger than the sum of its proper divisors (1).

72540753373447 is an equidigital number, since it uses as much as digits as its factorization.

72540753373447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207446400, while the sum is 61.

The spelling of 72540753373447 in words is "seventy-two trillion, five hundred forty billion, seven hundred fifty-three million, three hundred seventy-three thousand, four hundred forty-seven".