18701078481 has 6 divisors (see below), whose sum is σ = 27012668930. Its totient is φ = 12467385648.

The previous prime is 18701078479. The next prime is 18701078519. The reversal of 18701078481 is 18487010781.

It can be written as a sum of positive squares in only one way, i.e., 12016544400 + 6684534081 = 109620^2 + 81759^2 .

It is not a de Polignac number, because 18701078481 - 2¹ = 18701078479 is a prime.

It is a super-2 number, since 2×18701078481² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18701078411) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1038948796 + ... + 1038948813.

Almost surely, 2^18701078481 is an apocalyptic number.

It is an amenable number.

18701078481 is a deficient number, since it is larger than the sum of its proper divisors (8311590449).

18701078481 is a wasteful number, since it uses less digits than its factorization.

18701078481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2077897615 (or 2077897612 counting only the distinct ones).

The product of its (nonzero) digits is 100352, while the sum is 45.

The spelling of 18701078481 in words is "eighteen billion, seven hundred one million, seventy-eight thousand, four hundred eighty-one".