166953977 has 2 divisors, whose sum is σ = 166953978. Its totient is φ = 166953976.

The previous prime is 166953973. The next prime is 166954031. The reversal of 166953977 is 779359661.

It is a happy number.

166953977 is nontrivially palindromic in base 16.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144096016 + 22857961 = 12004^2 + 4781^2 .

It is an emirp because it is prime and its reverse (779359661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166953977 - 2² = 166953973 is a prime.

It is a super-2 number, since 2×166953977² = 55747260872233058, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166953973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83476988 + 83476989.

It is an arithmetic number, because the mean of its divisors is an integer number (83476989).

Almost surely, 2^166953977 is an apocalyptic number.

It is an amenable number.

166953977 is a deficient number, since it is larger than the sum of its proper divisors (1).

166953977 is an equidigital number, since it uses as much as digits as its factorization.

166953977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2143260, while the sum is 53.

The square root of 166953977 is about 12921.0671772884. The cubic root of 166953977 is about 550.6372525525.

The spelling of 166953977 in words is "one hundred sixty-six million, nine hundred fifty-three thousand, nine hundred seventy-seven".