166667953 has 2 divisors, whose sum is σ = 166667954. Its totient is φ = 166667952.

The previous prime is 166667951. The next prime is 166667999. The reversal of 166667953 is 359766661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117765904 + 48902049 = 10852^2 + 6993^2 .

It is an emirp because it is prime and its reverse (359766661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166667953 - 2¹ = 166667951 is a prime.

Together with 166667951, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 166667897 and 166667906.

It is not a weakly prime, because it can be changed into another prime (166667951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83333976 + 83333977.

It is an arithmetic number, because the mean of its divisors is an integer number (83333977).

Almost surely, 2^166667953 is an apocalyptic number.

It is an amenable number.

166667953 is a deficient number, since it is larger than the sum of its proper divisors (1).

166667953 is an equidigital number, since it uses as much as digits as its factorization.

166667953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1224720, while the sum is 49.

The square root of 166667953 is about 12909.9943067377. The cubic root of 166667953 is about 550.3226239385.

The spelling of 166667953 in words is "one hundred sixty-six million, six hundred sixty-seven thousand, nine hundred fifty-three".