66157214 has 4 divisors (see below), whose sum is σ = 99235824. Its totient is φ = 33078606.

The previous prime is 66157211. The next prime is 66157229. The reversal of 66157214 is 41275166.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 41275166 = 2 ⋅20637583.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66157211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16539302 + ... + 16539305.

It is an arithmetic number, because the mean of its divisors is an integer number (24808956).

Almost surely, 2^66157214 is an apocalyptic number.

66157214 is a deficient number, since it is larger than the sum of its proper divisors (33078610).

66157214 is a wasteful number, since it uses less digits than its factorization.

66157214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33078609.

The product of its digits is 10080, while the sum is 32.

The square root of 66157214 is about 8133.7085022762. The cubic root of 66157214 is about 404.4446261577. Note that the first 3 decimals are identical.

It can be divided in two parts, 661 and 57214, that added together give a palindrome (57875).

The spelling of 66157214 in words is "sixty-six million, one hundred fifty-seven thousand, two hundred fourteen".