66761530 has 64 divisors (see below), whose sum is σ = 136515456. Its totient is φ = 23296000.

The previous prime is 66761491. The next prime is 66761531. The reversal of 66761530 is 3516766.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (66761531) 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, 509565 + ... + 509695.

It is an arithmetic number, because the mean of its divisors is an integer number (2133054).

Almost surely, 2^66761530 is an apocalyptic number.

66761530 is an abundant number, since it is smaller than the sum of its proper divisors (69753926).

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

66761530 is a wasteful number, since it uses less digits than its factorization.

66761530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 66761530 is about 8170.7729132561. The cubic root of 66761530 is about 405.6723678720.

The spelling of 66761530 in words is "sixty-six million, seven hundred sixty-one thousand, five hundred thirty".