18963493247 has 2 divisors, whose sum is σ = 18963493248. Its totient is φ = 18963493246.

The previous prime is 18963493243. The next prime is 18963493277. The reversal of 18963493247 is 74239436981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18963493247 - 2² = 18963493243 is a prime.

It is a super-2 number, since 2×18963493247² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18963493192 and 18963493201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18963493243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9481746623 + 9481746624.

It is an arithmetic number, because the mean of its divisors is an integer number (9481746624).

Almost surely, 2^18963493247 is an apocalyptic number.

18963493247 is a deficient number, since it is larger than the sum of its proper divisors (1).

18963493247 is an equidigital number, since it uses as much as digits as its factorization.

18963493247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7838208, while the sum is 56.

The spelling of 18963493247 in words is "eighteen billion, nine hundred sixty-three million, four hundred ninety-three thousand, two hundred forty-seven".