81543156807 has 8 divisors (see below), whose sum is σ = 124256238976. Its totient is φ = 46596089592.

The previous prime is 81543156763. The next prime is 81543156847. The reversal of 81543156807 is 70865134518.

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

It is not a de Polignac number, because 81543156807 - 2¹⁰ = 81543155783 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 (81543156847) 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, 1941503713 + ... + 1941503754.

It is an arithmetic number, because the mean of its divisors is an integer number (15532029872).

Almost surely, 2^81543156807 is an apocalyptic number.

81543156807 is a deficient number, since it is larger than the sum of its proper divisors (42713082169).

81543156807 is a wasteful number, since it uses less digits than its factorization.

81543156807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3883007477.

The product of its (nonzero) digits is 806400, while the sum is 48.

The spelling of 81543156807 in words is "eighty-one billion, five hundred forty-three million, one hundred fifty-six thousand, eight hundred seven".