66570325261 has 16 divisors (see below), whose sum is σ = 74044111680. Its totient is φ = 59344980480.

The previous prime is 66570325259. The next prime is 66570325267. The reversal of 66570325261 is 16252307566.

It is a cyclic number.

It is not a de Polignac number, because 66570325261 - 2¹ = 66570325259 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66570325267) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 169891 + ... + 402496.

It is an arithmetic number, because the mean of its divisors is an integer number (4627756980).

Almost surely, 2^66570325261 is an apocalyptic number.

It is an amenable number.

66570325261 is a deficient number, since it is larger than the sum of its proper divisors (7473786419).

66570325261 is a wasteful number, since it uses less digits than its factorization.

66570325261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572604.

The product of its (nonzero) digits is 453600, while the sum is 43.

The spelling of 66570325261 in words is "sixty-six billion, five hundred seventy million, three hundred twenty-five thousand, two hundred sixty-one".