81503750671 has 8 divisors (see below), whose sum is σ = 93148909344. Its totient is φ = 69859033440.

The previous prime is 81503750651. The next prime is 81503750681. The reversal of 81503750671 is 17605730518.

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

It is not a de Polignac number, because 81503750671 - 2¹⁹ = 81503226383 is a prime.

It is a super-2 number, since 2×81503750671² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81503750621) 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, 543801 + ... + 677293.

It is an arithmetic number, because the mean of its divisors is an integer number (11643613668).

Almost surely, 2^81503750671 is an apocalyptic number.

81503750671 is a deficient number, since it is larger than the sum of its proper divisors (11645158673).

81503750671 is a wasteful number, since it uses less digits than its factorization.

81503750671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220721.

The product of its (nonzero) digits is 176400, while the sum is 43.

The spelling of 81503750671 in words is "eighty-one billion, five hundred three million, seven hundred fifty thousand, six hundred seventy-one".