66157071 has 8 divisors (see below), whose sum is σ = 88260144. Its totient is φ = 44079360.

The previous prime is 66157057. The next prime is 66157079. The reversal of 66157071 is 17075166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66157071 - 2⁷ = 66156943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66157079) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 945 + ... + 11541.

It is an arithmetic number, because the mean of its divisors is an integer number (11032518).

Almost surely, 2^66157071 is an apocalyptic number.

66157071 is a deficient number, since it is larger than the sum of its proper divisors (22103073).

66157071 is a wasteful number, since it uses less digits than its factorization.

66157071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12681.

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

The square root of 66157071 is about 8133.6997116933. The cubic root of 66157071 is about 404.4443347528. Note that the first 3 decimals are identical.

The spelling of 66157071 in words is "sixty-six million, one hundred fifty-seven thousand, seventy-one".