81203530751 has 8 divisors (see below), whose sum is σ = 93189116064. Its totient is φ = 69314215680.

The previous prime is 81203530747. The next prime is 81203530769. The reversal of 81203530751 is 15703530218.

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 81203530751 - 2² = 81203530747 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81203530151) 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, 24065750 + ... + 24069123.

It is an arithmetic number, because the mean of its divisors is an integer number (11648639508).

Almost surely, 2^81203530751 is an apocalyptic number.

81203530751 is a deficient number, since it is larger than the sum of its proper divisors (11985585313).

81203530751 is a wasteful number, since it uses less digits than its factorization.

81203530751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48135121.

The product of its (nonzero) digits is 25200, while the sum is 35.

The spelling of 81203530751 in words is "eighty-one billion, two hundred three million, five hundred thirty thousand, seven hundred fifty-one".