66954087252 has 36 divisors (see below), whose sum is σ = 182263905460. Its totient is φ = 20601257472.

The previous prime is 66954087247. The next prime is 66954087253. The reversal of 66954087252 is 25278045966.

It can be written as a sum of positive squares in 2 ways, for example, as 15049400976 + 51904686276 = 122676^2 + 227826^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66954087253) 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 11 ways as a sum of consecutive naturals, for example, 71531677 + ... + 71532612.

Almost surely, 2^66954087252 is an apocalyptic number.

It is an amenable number.

66954087252 is an abundant number, since it is smaller than the sum of its proper divisors (115309818208).

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

66954087252 is a wasteful number, since it uses less digits than its factorization.

66954087252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143064312 (or 143064307 counting only the distinct ones).

The product of its (nonzero) digits is 7257600, while the sum is 54.

The spelling of 66954087252 in words is "sixty-six billion, nine hundred fifty-four million, eighty-seven thousand, two hundred fifty-two".