72420017717623 has 2 divisors, whose sum is σ = 72420017717624. Its totient is φ = 72420017717622.

The previous prime is 72420017717561. The next prime is 72420017717651. The reversal of 72420017717623 is 32671771002427.

It is a strong prime.

It is an emirp because it is prime and its reverse (32671771002427) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72420017717623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72420017777623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36210008858811 + 36210008858812.

It is an arithmetic number, because the mean of its divisors is an integer number (36210008858812).

Almost surely, 2^{72420017717623} is an apocalyptic number.

72420017717623 is a deficient number, since it is larger than the sum of its proper divisors (1).

72420017717623 is an equidigital number, since it uses as much as digits as its factorization.

72420017717623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1382976, while the sum is 49.

The spelling of 72420017717623 in words is "seventy-two trillion, four hundred twenty billion, seventeen million, seven hundred seventeen thousand, six hundred twenty-three".