66201652909 has 24 divisors (see below), whose sum is σ = 81609217848. Its totient is φ = 53361100800.

The previous prime is 66201652897. The next prime is 66201652927. The reversal of 66201652909 is 90925610266.

It can be written as a sum of positive squares in 4 ways, for example, as 667188900 + 65534464009 = 25830^2 + 255997^2 .

It is not a de Polignac number, because 66201652909 - 2¹⁵ = 66201620141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66201652109) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 967347 + ... + 1033519.

It is an arithmetic number, because the mean of its divisors is an integer number (3400384077).

Almost surely, 2^66201652909 is an apocalyptic number.

It is an amenable number.

66201652909 is a deficient number, since it is larger than the sum of its proper divisors (15407564939).

66201652909 is a wasteful number, since it uses less digits than its factorization.

66201652909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67405 (or 67398 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 46.

The spelling of 66201652909 in words is "sixty-six billion, two hundred one million, six hundred fifty-two thousand, nine hundred nine".