66501270 has 64 divisors (see below), whose sum is σ = 193466880. Its totient is φ = 16120800.

The previous prime is 66501241. The next prime is 66501271. The reversal of 66501270 is 7210566.

66501270 is a `hidden beast` number, since 6 + 650 + 1 + 2 + 7 + 0 = 666.

It is a super-2 number, since 2×66501270² = 8844837823225800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66501271) 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 31 ways as a sum of consecutive naturals, for example, 8226 + ... + 14165.

It is an arithmetic number, because the mean of its divisors is an integer number (3022920).

Almost surely, 2^66501270 is an apocalyptic number.

66501270 is an abundant number, since it is smaller than the sum of its proper divisors (126965610).

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

66501270 is a wasteful number, since it uses less digits than its factorization.

66501270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22418 (or 22412 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 66501270 is about 8154.8310834744. The cubic root of 66501270 is about 405.1445300349.

The spelling of 66501270 in words is "sixty-six million, five hundred one thousand, two hundred seventy".