66457707 has 32 divisors (see below), whose sum is σ = 94832640. Its totient is φ = 41333760.

The previous prime is 66457693. The next prime is 66457751. The reversal of 66457707 is 70775466.

It is not a de Polignac number, because 66457707 - 2⁴ = 66457691 is a prime.

It is a super-3 number, since 3×66457707³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (66457757) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 478044 + ... + 478182.

It is an arithmetic number, because the mean of its divisors is an integer number (2963520).

Almost surely, 2^66457707 is an apocalyptic number.

66457707 is a deficient number, since it is larger than the sum of its proper divisors (28374933).

66457707 is a wasteful number, since it uses less digits than its factorization.

66457707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323.

The product of its (nonzero) digits is 246960, while the sum is 42.

The square root of 66457707 is about 8152.1596525093. The cubic root of 66457707 is about 405.0560446751.

The spelling of 66457707 in words is "sixty-six million, four hundred fifty-seven thousand, seven hundred seven".