66542271952 has 40 divisors (see below), whose sum is σ = 138859968296. Its totient is φ = 30708066816.

The previous prime is 66542271857. The next prime is 66542271967. The reversal of 66542271952 is 25917224566.

It can be written as a sum of positive squares in 4 ways, for example, as 15609004096 + 50933267856 = 124936^2 + 225684^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66542271896 and 66542271905.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2415118 + ... + 2442514.

Almost surely, 2^66542271952 is an apocalyptic number.

It is an amenable number.

66542271952 is an abundant number, since it is smaller than the sum of its proper divisors (72317696344).

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

66542271952 is a wasteful number, since it uses less digits than its factorization.

66542271952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39095 (or 39089 counting only the distinct ones).

The product of its digits is 1814400, while the sum is 49.

The spelling of 66542271952 in words is "sixty-six billion, five hundred forty-two million, two hundred seventy-one thousand, nine hundred fifty-two".