66602312550 has 36 divisors (see below), whose sum is σ = 178938214260. Its totient is φ = 17760616560.

The previous prime is 66602312531. The next prime is 66602312551. The reversal of 66602312550 is 5521320666.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66602312551) by changing a digit.

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 17 ways as a sum of consecutive naturals, for example, 74002120 + ... + 74003019.

Almost surely, 2^66602312550 is an apocalyptic number.

66602312550 is an abundant number, since it is smaller than the sum of its proper divisors (112335901710).

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

66602312550 is a wasteful number, since it uses less digits than its factorization.

66602312550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148005157 (or 148005149 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The spelling of 66602312550 in words is "sixty-six billion, six hundred two million, three hundred twelve thousand, five hundred fifty".