81125480728501 has 8 divisors (see below), whose sum is σ = 88502740913664. Its totient is φ = 73748589957120.

The previous prime is 81125480728499. The next prime is 81125480728583. The reversal of 81125480728501 is 10582708452118.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81125480728501 - 2¹ = 81125480728499 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81125480798501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91894165 + ... + 92772778.

It is an arithmetic number, because the mean of its divisors is an integer number (11062842614208).

Almost surely, 2^{81125480728501} is an apocalyptic number.

It is an amenable number.

81125480728501 is a deficient number, since it is larger than the sum of its proper divisors (7377260185163).

81125480728501 is a wasteful number, since it uses less digits than its factorization.

81125480728501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184706891.

The product of its (nonzero) digits is 1433600, while the sum is 52.

The spelling of 81125480728501 in words is "eighty-one trillion, one hundred twenty-five billion, four hundred eighty million, seven hundred twenty-eight thousand, five hundred one".