81424042418 has 32 divisors (see below), whose sum is σ = 130300123824. Its totient is φ = 38027538432.

The previous prime is 81424042379. The next prime is 81424042421.

81424042418 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 8 ways, for example, as 47257107769 + 34166934649 = 217387^2 + 184843^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4672730 + ... + 4690122.

Almost surely, 2^81424042418 is an apocalyptic number.

81424042418 is a deficient number, since it is larger than the sum of its proper divisors (48876081406).

81424042418 is a wasteful number, since it uses less digits than its factorization.

81424042418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18446.

The product of its (nonzero) digits is 65536, while the sum is 38.

It can be divided in two parts, 814240 and 42418, that added together give a palindrome (856658).

The spelling of 81424042418 in words is "eighty-one billion, four hundred twenty-four million, forty-two thousand, four hundred eighteen".