66201623872 has 14 divisors (see below), whose sum is σ = 131368847498. Its totient is φ = 33100811904.

The previous prime is 66201623869. The next prime is 66201623959. The reversal of 66201623872 is 27832610266.

It can be written as a sum of positive squares in only one way, i.e., 37875387456 + 28326236416 = 194616^2 + 168304^2 .

It is a congruent 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 as a sum of consecutive naturals, namely, 517200123 + ... + 517200250.

It is an arithmetic number, because the mean of its divisors is an integer number (9383489107).

Almost surely, 2^66201623872 is an apocalyptic number.

It is an amenable number.

66201623872 is a deficient number, since it is larger than the sum of its proper divisors (65167223626).

66201623872 is a wasteful number, since it uses less digits than its factorization.

66201623872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1034400385 (or 1034400375 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 43.

The spelling of 66201623872 in words is "sixty-six billion, two hundred one million, six hundred twenty-three thousand, eight hundred seventy-two".