66117507 has 4 divisors (see below), whose sum is σ = 88156680. Its totient is φ = 44078336.

The previous prime is 66117481. The next prime is 66117509. The reversal of 66117507 is 70571166.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66117507 - 2⁸ = 66117251 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66117509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11019582 + ... + 11019587.

It is an arithmetic number, because the mean of its divisors is an integer number (22039170).

Almost surely, 2^66117507 is an apocalyptic number.

66117507 is a deficient number, since it is larger than the sum of its proper divisors (22039173).

66117507 is a wasteful number, since it uses less digits than its factorization.

66117507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22039172.

The product of its (nonzero) digits is 8820, while the sum is 33.

The square root of 66117507 is about 8131.2672444091. The cubic root of 66117507 is about 404.3636952169.

The spelling of 66117507 in words is "sixty-six million, one hundred seventeen thousand, five hundred seven".