66156500 has 24 divisors (see below), whose sum is σ = 144486888. Its totient is φ = 26462400.

The previous prime is 66156491. The next prime is 66156509. The reversal of 66156500 is 565166.

It is an interprime number because it is at equal distance from previous prime (66156491) and next prime (66156509).

It can be written as a sum of positive squares in 4 ways, for example, as 8213956 + 57942544 = 2866^2 + 7612^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66156509) 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, 65657 + ... + 66656.

It is an arithmetic number, because the mean of its divisors is an integer number (6020287).

Almost surely, 2^66156500 is an apocalyptic number.

It is an amenable number.

66156500 is an abundant number, since it is smaller than the sum of its proper divisors (78330388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66156500 is a wasteful number, since it uses less digits than its factorization.

66156500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132332 (or 132320 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 66156500 is about 8133.6646107397. The cubic root of 66156500 is about 404.4431711665.

The spelling of 66156500 in words is "sixty-six million, one hundred fifty-six thousand, five hundred".