166994499653 has 2 divisors, whose sum is σ = 166994499654. Its totient is φ = 166994499652.

The previous prime is 166994499649. The next prime is 166994499799. The reversal of 166994499653 is 356994499661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118083638689 + 48910860964 = 343633^2 + 221158^2 .

It is a cyclic number.

It is not a de Polignac number, because 166994499653 - 2² = 166994499649 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166994499613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83497249826 + 83497249827.

It is an arithmetic number, because the mean of its divisors is an integer number (83497249827).

Almost surely, 2^166994499653 is an apocalyptic number.

It is an amenable number.

166994499653 is a deficient number, since it is larger than the sum of its proper divisors (1).

166994499653 is an equidigital number, since it uses as much as digits as its factorization.

166994499653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 340122240, while the sum is 71.

The spelling of 166994499653 in words is "one hundred sixty-six billion, nine hundred ninety-four million, four hundred ninety-nine thousand, six hundred fifty-three".