81543153867 has 16 divisors (see below), whose sum is σ = 124511396352. Its totient is φ = 46500402240.

The previous prime is 81543153847. The next prime is 81543153907. The reversal of 81543153867 is 76835134518.

It is not a de Polignac number, because 81543153867 - 2⁷ = 81543153739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81543153847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3976434 + ... + 3996887.

It is an arithmetic number, because the mean of its divisors is an integer number (7781962272).

Almost surely, 2^81543153867 is an apocalyptic number.

81543153867 is a deficient number, since it is larger than the sum of its proper divisors (42968242485).

81543153867 is a wasteful number, since it uses less digits than its factorization.

81543153867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7973818.

The product of its digits is 2419200, while the sum is 51.

The spelling of 81543153867 in words is "eighty-one billion, five hundred forty-three million, one hundred fifty-three thousand, eight hundred sixty-seven".