81667734423 has 8 divisors (see below), whose sum is σ = 118789431936. Its totient is φ = 49495596600.

The previous prime is 81667734413. The next prime is 81667734427. The reversal of 81667734423 is 32443776618.

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

It is not a de Polignac number, because 81667734423 - 2¹⁸ = 81667472279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81667734427) 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, 1237389883 + ... + 1237389948.

It is an arithmetic number, because the mean of its divisors is an integer number (14848678992).

Almost surely, 2^81667734423 is an apocalyptic number.

81667734423 is a deficient number, since it is larger than the sum of its proper divisors (37121697513).

81667734423 is a wasteful number, since it uses less digits than its factorization.

81667734423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2474779845.

The product of its digits is 4064256, while the sum is 51.

The spelling of 81667734423 in words is "eighty-one billion, six hundred sixty-seven million, seven hundred thirty-four thousand, four hundred twenty-three".