66920507 has 4 divisors (see below), whose sum is σ = 66959040. Its totient is φ = 66881976.

The previous prime is 66920473. The next prime is 66920509. The reversal of 66920507 is 70502966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70502966 = 2 ⋅35251483.

It is a cyclic number.

It is not a de Polignac number, because 66920507 - 2⁶ = 66920443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66920509) 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, 16532 + ... + 20177.

It is an arithmetic number, because the mean of its divisors is an integer number (16739760).

Almost surely, 2^66920507 is an apocalyptic number.

66920507 is a deficient number, since it is larger than the sum of its proper divisors (38533).

66920507 is a wasteful number, since it uses less digits than its factorization.

66920507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38532.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 66920507 is about 8180.4955228886. The cubic root of 66920507 is about 405.9941173001.

The spelling of 66920507 in words is "sixty-six million, nine hundred twenty thousand, five hundred seven".