81454872164 has 12 divisors (see below), whose sum is σ = 143072028288. Its totient is φ = 40577149800.

The previous prime is 81454872133. The next prime is 81454872167. The reversal of 81454872164 is 46127845418.

It is a super-3 number, since 3×81454872164³ (a number of 34 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (81454872167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37570352 + ... + 37572519.

It is an arithmetic number, because the mean of its divisors is an integer number (11922669024).

Almost surely, 2^81454872164 is an apocalyptic number.

It is an amenable number.

81454872164 is a deficient number, since it is larger than the sum of its proper divisors (61617156124).

81454872164 is a wasteful number, since it uses less digits than its factorization.

81454872164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75143146 (or 75143144 counting only the distinct ones).

The product of its digits is 1720320, while the sum is 50.

The spelling of 81454872164 in words is "eighty-one billion, four hundred fifty-four million, eight hundred seventy-two thousand, one hundred sixty-four".