166736987827 has 2 divisors, whose sum is σ = 166736987828. Its totient is φ = 166736987826.

The previous prime is 166736987797. The next prime is 166736987891. The reversal of 166736987827 is 728789637661.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166736987827 - 2¹⁵ = 166736955059 is a prime.

It is a super-2 number, since 2×166736987827² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166736987227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83368493913 + 83368493914.

It is an arithmetic number, because the mean of its divisors is an integer number (83368493914).

Almost surely, 2^166736987827 is an apocalyptic number.

166736987827 is a deficient number, since it is larger than the sum of its proper divisors (1).

166736987827 is an equidigital number, since it uses as much as digits as its factorization.

166736987827 is an evil number, because the sum of its binary digits is even.

The product of its digits is 256048128, while the sum is 70.

The spelling of 166736987827 in words is "one hundred sixty-six billion, seven hundred thirty-six million, nine hundred eighty-seven thousand, eight hundred twenty-seven".