81724078601 has 32 divisors (see below), whose sum is σ = 92511936000. Its totient is φ = 71555892480.

The previous prime is 81724078549. The next prime is 81724078603. The reversal of 81724078601 is 10687042718.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81724078601 is a prime.

It is a super-2 number, since 2×81724078601² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81724078603) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8391731 + ... + 8401463.

It is an arithmetic number, because the mean of its divisors is an integer number (2890998000).

Almost surely, 2^81724078601 is an apocalyptic number.

It is an amenable number.

81724078601 is a deficient number, since it is larger than the sum of its proper divisors (10787857399).

81724078601 is a wasteful number, since it uses less digits than its factorization.

81724078601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10049.

The product of its (nonzero) digits is 150528, while the sum is 44.

The spelling of 81724078601 in words is "eighty-one billion, seven hundred twenty-four million, seventy-eight thousand, six hundred one".