18737040613 has 2 divisors, whose sum is σ = 18737040614. Its totient is φ = 18737040612.

The previous prime is 18737040593. The next prime is 18737040649. The reversal of 18737040613 is 31604073781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12233908449 + 6503132164 = 110607^2 + 80642^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18737040613 is a prime.

It is a super-3 number, since 3×18737040613³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18737043613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9368520306 + 9368520307.

It is an arithmetic number, because the mean of its divisors is an integer number (9368520307).

Almost surely, 2^18737040613 is an apocalyptic number.

It is an amenable number.

18737040613 is a deficient number, since it is larger than the sum of its proper divisors (1).

18737040613 is an equidigital number, since it uses as much as digits as its factorization.

18737040613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 40.

The spelling of 18737040613 in words is "eighteen billion, seven hundred thirty-seven million, forty thousand, six hundred thirteen".