81450662371 has 4 divisors (see below), whose sum is σ = 87716097952. Its totient is φ = 75185226792.

The previous prime is 81450662357. The next prime is 81450662401. The reversal of 81450662371 is 17326605418.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 81450662371 - 2¹³ = 81450654179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81450662071) 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 3 ways as a sum of consecutive naturals, for example, 3132717771 + ... + 3132717796.

It is an arithmetic number, because the mean of its divisors is an integer number (21929024488).

Almost surely, 2^81450662371 is an apocalyptic number.

81450662371 is a deficient number, since it is larger than the sum of its proper divisors (6265435581).

81450662371 is a wasteful number, since it uses less digits than its factorization.

81450662371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6265435580.

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 81450662371 in words is "eighty-one billion, four hundred fifty million, six hundred sixty-two thousand, three hundred seventy-one".