72846664571 has 2 divisors, whose sum is σ = 72846664572. Its totient is φ = 72846664570.

The previous prime is 72846664549. The next prime is 72846664603. The reversal of 72846664571 is 17546664827.

It is a weak prime.

It is an emirp because it is prime and its reverse (17546664827) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72846664571 is a prime.

It is a super-2 number, since 2×72846664571² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72846664871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36423332285 + 36423332286.

It is an arithmetic number, because the mean of its divisors is an integer number (36423332286).

Almost surely, 2^72846664571 is an apocalyptic number.

72846664571 is a deficient number, since it is larger than the sum of its proper divisors (1).

72846664571 is an equidigital number, since it uses as much as digits as its factorization.

72846664571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13547520, while the sum is 56.

The spelling of 72846664571 in words is "seventy-two billion, eight hundred forty-six million, six hundred sixty-four thousand, five hundred seventy-one".