66075757 has 8 divisors (see below), whose sum is σ = 75216960. Its totient is φ = 57456960.

The previous prime is 66075727. The next prime is 66075767. The reversal of 66075757 is 75757066.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66075757 - 2⁷ = 66075629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66075707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130332 + ... + 130837.

It is an arithmetic number, because the mean of its divisors is an integer number (9402120).

Almost surely, 2^66075757 is an apocalyptic number.

It is an amenable number.

66075757 is a deficient number, since it is larger than the sum of its proper divisors (9141203).

66075757 is a wasteful number, since it uses less digits than its factorization.

66075757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261203.

The product of its (nonzero) digits is 308700, while the sum is 43.

The square root of 66075757 is about 8128.6995884951. The cubic root of 66075757 is about 404.2785652731.

The spelling of 66075757 in words is "sixty-six million, seventy-five thousand, seven hundred fifty-seven".