72417720146647 has 2 divisors, whose sum is σ = 72417720146648. Its totient is φ = 72417720146646.

The previous prime is 72417720146593. The next prime is 72417720146687. The reversal of 72417720146647 is 74664102771427.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72417720146647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72417720146591 and 72417720146600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72417720146687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36208860073323 + 36208860073324.

It is an arithmetic number, because the mean of its divisors is an integer number (36208860073324).

Almost surely, 2^{72417720146647} is an apocalyptic number.

72417720146647 is a deficient number, since it is larger than the sum of its proper divisors (1).

72417720146647 is an equidigital number, since it uses as much as digits as its factorization.

72417720146647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22127616, while the sum is 58.

The spelling of 72417720146647 in words is "seventy-two trillion, four hundred seventeen billion, seven hundred twenty million, one hundred forty-six thousand, six hundred forty-seven".