66490297 has 4 divisors (see below), whose sum is σ = 66508020. Its totient is φ = 66472576.

The previous prime is 66490261. The next prime is 66490321. The reversal of 66490297 is 79209466.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27290176 + 39200121 = 5224^2 + 6261^2 .

It is a cyclic number.

It is not a de Polignac number, because 66490297 - 2¹⁹ = 65966009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66400297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 772 + ... + 11557.

It is an arithmetic number, because the mean of its divisors is an integer number (16627005).

Almost surely, 2^66490297 is an apocalyptic number.

It is an amenable number.

66490297 is a deficient number, since it is larger than the sum of its proper divisors (17723).

66490297 is a wasteful number, since it uses less digits than its factorization.

66490297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17722.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 66490297 is about 8154.1582643459. The cubic root of 66490297 is about 405.1222452702.

The spelling of 66490297 in words is "sixty-six million, four hundred ninety thousand, two hundred ninety-seven".