662166649 has 2 divisors, whose sum is σ = 662166650. Its totient is φ = 662166648.

The previous prime is 662166629. The next prime is 662166707. The reversal of 662166649 is 946661266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 479916649 + 182250000 = 21907^2 + 13500^2 .

It is a cyclic number.

It is not a de Polignac number, because 662166649 - 2⁷ = 662166521 is a prime.

It is equal to p_34392988 and since 662166649 and 34392988 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 662166599 and 662166608.

It is not a weakly prime, because it can be changed into another prime (662166629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331083324 + 331083325.

It is an arithmetic number, because the mean of its divisors is an integer number (331083325).

Almost surely, 2^662166649 is an apocalyptic number.

It is an amenable number.

662166649 is a deficient number, since it is larger than the sum of its proper divisors (1).

662166649 is an equidigital number, since it uses as much as digits as its factorization.

662166649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 46.

The square root of 662166649 is about 25732.5989554106. The cubic root of 662166649 is about 871.6104617786.

The spelling of 662166649 in words is "six hundred sixty-two million, one hundred sixty-six thousand, six hundred forty-nine".