81520158943 has 8 divisors (see below), whose sum is σ = 83825167328. Its totient is φ = 79220506464.

The previous prime is 81520158913. The next prime is 81520158947. The reversal of 81520158943 is 34985102518.

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 81520158943 - 2²¹ = 81518061791 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81520158893 and 81520158902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81520158947) 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, 1308096 + ... + 1368997.

It is an arithmetic number, because the mean of its divisors is an integer number (10478145916).

Almost surely, 2^81520158943 is an apocalyptic number.

81520158943 is a deficient number, since it is larger than the sum of its proper divisors (2305008385).

81520158943 is a wasteful number, since it uses less digits than its factorization.

81520158943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2677953.

The product of its (nonzero) digits is 345600, while the sum is 46.

The spelling of 81520158943 in words is "eighty-one billion, five hundred twenty million, one hundred fifty-eight thousand, nine hundred forty-three".