66530156 has 72 divisors (see below), whose sum is σ = 148811040. Its totient is φ = 25470720.

The previous prime is 66530141. The next prime is 66530179. The reversal of 66530156 is 65103566.

66530156 = T₂₃₃ + T₂₃₄ + ... + T₇₄₃.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 247190 + ... + 247458.

It is an arithmetic number, because the mean of its divisors is an integer number (2066820).

Almost surely, 2^66530156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66530156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74405520).

66530156 is an abundant number, since it is smaller than the sum of its proper divisors (82280884).

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

66530156 is a wasteful number, since it uses less digits than its factorization.

66530156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375 (or 362 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 66530156 is about 8156.6019885734. The cubic root of 66530156 is about 405.2031821019.

The spelling of 66530156 in words is "sixty-six million, five hundred thirty thousand, one hundred fifty-six".