18948321671 has 2 divisors, whose sum is σ = 18948321672. Its totient is φ = 18948321670.

The previous prime is 18948321607. The next prime is 18948321709. The reversal of 18948321671 is 17612384981.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18948321671 - 2⁶ = 18948321607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18948321971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9474160835 + 9474160836.

It is an arithmetic number, because the mean of its divisors is an integer number (9474160836).

Almost surely, 2^18948321671 is an apocalyptic number.

18948321671 is a deficient number, since it is larger than the sum of its proper divisors (1).

18948321671 is an equidigital number, since it uses as much as digits as its factorization.

18948321671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 50.

The spelling of 18948321671 in words is "eighteen billion, nine hundred forty-eight million, three hundred twenty-one thousand, six hundred seventy-one".