18994507174387 has 2 divisors, whose sum is σ = 18994507174388. Its totient is φ = 18994507174386.

The previous prime is 18994507174367. The next prime is 18994507174399. The reversal of 18994507174387 is 78347170549981.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18994507174387 is a prime.

It is not a weakly prime, because it can be changed into another prime (18994507174337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9497253587193 + 9497253587194.

It is an arithmetic number, because the mean of its divisors is an integer number (9497253587194).

Almost surely, 2^{18994507174387} is an apocalyptic number.

18994507174387 is a deficient number, since it is larger than the sum of its proper divisors (1).

18994507174387 is an equidigital number, since it uses as much as digits as its factorization.

18994507174387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 426746880, while the sum is 73.

The spelling of 18994507174387 in words is "eighteen trillion, nine hundred ninety-four billion, five hundred seven million, one hundred seventy-four thousand, three hundred eighty-seven".