66185157 has 8 divisors (see below), whose sum is σ = 88302400. Its totient is φ = 44095680.

The previous prime is 66185143. The next prime is 66185159. The reversal of 66185157 is 75158166.

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

It is not a de Polignac number, because 66185157 - 2¹² = 66181061 is a prime.

It is a super-2 number, since 2×66185157² = 8760950014229298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66185159) 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 in 7 ways as a sum of consecutive naturals, for example, 532 + ... + 11517.

It is an arithmetic number, because the mean of its divisors is an integer number (11037800).

Almost surely, 2^66185157 is an apocalyptic number.

It is an amenable number.

66185157 is a deficient number, since it is larger than the sum of its proper divisors (22117243).

66185157 is a wasteful number, since it uses less digits than its factorization.

66185157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13883.

The product of its digits is 50400, while the sum is 39.

The square root of 66185157 is about 8135.4260490770. The cubic root of 66185157 is about 404.5015602634.

The spelling of 66185157 in words is "sixty-six million, one hundred eighty-five thousand, one hundred fifty-seven".