166428419987 has 2 divisors, whose sum is σ = 166428419988. Its totient is φ = 166428419986.

The previous prime is 166428419947. The next prime is 166428420007. The reversal of 166428419987 is 789914824661.

It is a strong prime.

It is an emirp because it is prime and its reverse (789914824661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166428419987 - 2³⁰ = 165354678163 is a prime.

It is a super-2 number, since 2×166428419987² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166428419947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83214209993 + 83214209994.

It is an arithmetic number, because the mean of its divisors is an integer number (83214209994).

Almost surely, 2^166428419987 is an apocalyptic number.

166428419987 is a deficient number, since it is larger than the sum of its proper divisors (1).

166428419987 is an equidigital number, since it uses as much as digits as its factorization.

166428419987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41803776, while the sum is 65.

The spelling of 166428419987 in words is "one hundred sixty-six billion, four hundred twenty-eight million, four hundred nineteen thousand, nine hundred eighty-seven".