66750417 has 12 divisors (see below), whose sum is σ = 98052240. Its totient is φ = 43745688.

The previous prime is 66750413. The next prime is 66750421. The reversal of 66750417 is 71405766.

It is an interprime number because it is at equal distance from previous prime (66750413) and next prime (66750421).

It is not a de Polignac number, because 66750417 - 2² = 66750413 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66750413) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62323 + ... + 63384.

It is an arithmetic number, because the mean of its divisors is an integer number (8171020).

Almost surely, 2^66750417 is an apocalyptic number.

It is an amenable number.

66750417 is a deficient number, since it is larger than the sum of its proper divisors (31301823).

66750417 is a wasteful number, since it uses less digits than its factorization.

66750417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125772 (or 125769 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 66750417 is about 8170.0928391298. The cubic root of 66750417 is about 405.6498574672.

The spelling of 66750417 in words is "sixty-six million, seven hundred fifty thousand, four hundred seventeen".