66040257 has 36 divisors (see below), whose sum is σ = 99188016. Its totient is φ = 39070080.

The previous prime is 66040243. The next prime is 66040297. The reversal of 66040257 is 75204066.

It is not a de Polignac number, because 66040257 - 2²⁴ = 49263041 is a prime.

It is a super-2 number, since 2×66040257² = 8722631089252098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66040297) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 312882 + ... + 313092.

Almost surely, 2^66040257 is an apocalyptic number.

It is an amenable number.

66040257 is a deficient number, since it is larger than the sum of its proper divisors (33147759).

66040257 is a wasteful number, since it uses less digits than its factorization.

66040257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286 (or 250 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 66040257 is about 8126.5156740143. The cubic root of 66040257 is about 404.2061511194.

The spelling of 66040257 in words is "sixty-six million, forty thousand, two hundred fifty-seven".