18541534436 has 6 divisors (see below), whose sum is σ = 32447685270. Its totient is φ = 9270767216.

The previous prime is 18541534409. The next prime is 18541534439. The reversal of 18541534436 is 63443514581.

It can be written as a sum of positive squares in only one way, i.e., 16587894436 + 1953640000 = 128794^2 + 44200^2 .

It is not an unprimeable number, because it can be changed into a prime (18541534439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2317691801 + ... + 2317691808.

It is an arithmetic number, because the mean of its divisors is an integer number (5407947545).

Almost surely, 2^18541534436 is an apocalyptic number.

It is an amenable number.

18541534436 is a deficient number, since it is larger than the sum of its proper divisors (13906150834).

18541534436 is a wasteful number, since it uses less digits than its factorization.

18541534436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4635383613 (or 4635383611 counting only the distinct ones).

The product of its digits is 691200, while the sum is 44.

The spelling of 18541534436 in words is "eighteen billion, five hundred forty-one million, five hundred thirty-four thousand, four hundred thirty-six".