18711820951 has 2 divisors, whose sum is σ = 18711820952. Its totient is φ = 18711820950.

The previous prime is 18711820909. The next prime is 18711820969. The reversal of 18711820951 is 15902811781.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (15902811781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18711820951 - 2¹¹ = 18711818903 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18711820898 and 18711820907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18711820991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9355910475 + 9355910476.

It is an arithmetic number, because the mean of its divisors is an integer number (9355910476).

Almost surely, 2^18711820951 is an apocalyptic number.

18711820951 is a deficient number, since it is larger than the sum of its proper divisors (1).

18711820951 is an equidigital number, since it uses as much as digits as its factorization.

18711820951 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 43.

The spelling of 18711820951 in words is "eighteen billion, seven hundred eleven million, eight hundred twenty thousand, nine hundred fifty-one".