18487944657131 has 2 divisors, whose sum is σ = 18487944657132. Its totient is φ = 18487944657130.

The previous prime is 18487944657109. The next prime is 18487944657137. The reversal of 18487944657131 is 13175644978481.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18487944657131 - 2¹⁰ = 18487944656107 is a prime.

It is a super-2 number, since 2×18487944657131² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18487944657137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9243972328565 + 9243972328566.

It is an arithmetic number, because the mean of its divisors is an integer number (9243972328566).

Almost surely, 2^{18487944657131} is an apocalyptic number.

18487944657131 is a deficient number, since it is larger than the sum of its proper divisors (1).

18487944657131 is an equidigital number, since it uses as much as digits as its factorization.

18487944657131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 162570240, while the sum is 68.

The spelling of 18487944657131 in words is "eighteen trillion, four hundred eighty-seven billion, nine hundred forty-four million, six hundred fifty-seven thousand, one hundred thirty-one".