66541421730 has 64 divisors (see below), whose sum is σ = 183055392000. Its totient is φ = 15164319744.

The previous prime is 66541421699. The next prime is 66541421753. The reversal of 66541421730 is 3712414566.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 399355 + ... + 540894.

It is an arithmetic number, because the mean of its divisors is an integer number (2860240500).

Almost surely, 2^66541421730 is an apocalyptic number.

66541421730 is an abundant number, since it is smaller than the sum of its proper divisors (116513970270).

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

66541421730 is a wasteful number, since it uses less digits than its factorization.

66541421730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 940603.

The product of its (nonzero) digits is 120960, while the sum is 39.

The spelling of 66541421730 in words is "sixty-six billion, five hundred forty-one million, four hundred twenty-one thousand, seven hundred thirty".