66121297 has 18 divisors (see below), whose sum is σ = 76049666. Its totient is φ = 57441120.

The previous prime is 66121271. The next prime is 66121301. The reversal of 66121297 is 79212166.

It can be written as a sum of positive squares in only one way, i.e., 65545216 + 576081 = 8096^2 + 759^2 .

It is not a de Polignac number, because 66121297 - 2⁷ = 66121169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66122297) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 63493 + ... + 64525.

Almost surely, 2^66121297 is an apocalyptic number.

It is an amenable number.

66121297 is a deficient number, since it is larger than the sum of its proper divisors (9928369).

66121297 is a wasteful number, since it uses less digits than its factorization.

66121297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101 (or 1067 counting only the distinct ones).

The product of its digits is 9072, while the sum is 34.

The square root of 66121297 is about 8131.5002920740. The cubic root of 66121297 is about 404.3714214062.

The spelling of 66121297 in words is "sixty-six million, one hundred twenty-one thousand, two hundred ninety-seven".