81542374267 has 16 divisors (see below), whose sum is σ = 86726505600. Its totient is φ = 76401616000.

The previous prime is 81542374259. The next prime is 81542374279. The reversal of 81542374267 is 76247324518.

It is a cyclic number.

It is not a de Polignac number, because 81542374267 - 2³ = 81542374259 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81542374267.

It is not an unprimeable number, because it can be changed into a prime (81542374247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12025284 + ... + 12032062.

It is an arithmetic number, because the mean of its divisors is an integer number (5420406600).

Almost surely, 2^81542374267 is an apocalyptic number.

81542374267 is a deficient number, since it is larger than the sum of its proper divisors (5184131333).

81542374267 is a wasteful number, since it uses less digits than its factorization.

81542374267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9866.

The product of its digits is 2257920, while the sum is 49.

The spelling of 81542374267 in words is "eighty-one billion, five hundred forty-two million, three hundred seventy-four thousand, two hundred sixty-seven".