66515049 has 6 divisors (see below), whose sum is σ = 96077306. Its totient is φ = 44343360.

The previous prime is 66515041. The next prime is 66515051. The reversal of 66515049 is 94051566.

It can be written as a sum of positive squares in only one way, i.e., 58064400 + 8450649 = 7620^2 + 2907^2 .

It is not a de Polignac number, because 66515049 - 2³ = 66515041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66515041) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3695272 + ... + 3695289.

Almost surely, 2^66515049 is an apocalyptic number.

It is an amenable number.

66515049 is a deficient number, since it is larger than the sum of its proper divisors (29562257).

66515049 is a wasteful number, since it uses less digits than its factorization.

66515049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7390567 (or 7390564 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 66515049 is about 8155.6758763453. The cubic root of 66515049 is about 405.1725099565.

The spelling of 66515049 in words is "sixty-six million, five hundred fifteen thousand, forty-nine".