18966527971 has 2 divisors, whose sum is σ = 18966527972. Its totient is φ = 18966527970.

The previous prime is 18966527933. The next prime is 18966528017. The reversal of 18966527971 is 17972566981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18966527971 - 2¹¹ = 18966525923 is a prime.

It is not a weakly prime, because it can be changed into another prime (18966587971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9483263985 + 9483263986.

It is an arithmetic number, because the mean of its divisors is an integer number (9483263986).

Almost surely, 2^18966527971 is an apocalyptic number.

18966527971 is a deficient number, since it is larger than the sum of its proper divisors (1).

18966527971 is an equidigital number, since it uses as much as digits as its factorization.

18966527971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11430720, while the sum is 61.

The spelling of 18966527971 in words is "eighteen billion, nine hundred sixty-six million, five hundred twenty-seven thousand, nine hundred seventy-one".