66157067 has 4 divisors (see below), whose sum is σ = 67770696. Its totient is φ = 64543440.

The previous prime is 66157057. The next prime is 66157079. The reversal of 66157067 is 76075166.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76075166 = 2 ⋅38037583.

It is a cyclic number.

It is not a de Polignac number, because 66157067 - 2⁴ = 66157051 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66157067.

It is not an unprimeable number, because it can be changed into a prime (66157057) 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, 806753 + ... + 806834.

It is an arithmetic number, because the mean of its divisors is an integer number (16942674).

Almost surely, 2^66157067 is an apocalyptic number.

66157067 is a deficient number, since it is larger than the sum of its proper divisors (1613629).

66157067 is a wasteful number, since it uses less digits than its factorization.

66157067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1613628.

The product of its (nonzero) digits is 52920, while the sum is 38.

The square root of 66157067 is about 8133.6994658028. The cubic root of 66157067 is about 404.4443266016. Note that the first 3 decimals are identical.

The spelling of 66157067 in words is "sixty-six million, one hundred fifty-seven thousand, sixty-seven".