66566557010 has 8 divisors (see below), whose sum is σ = 119819802636. Its totient is φ = 26626622800.

The previous prime is 66566557009. The next prime is 66566557037. The reversal of 66566557010 is 1075566566.

It can be written as a sum of positive squares in 2 ways, for example, as 66563484001 + 3073009 = 257999^2 + 1753^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×66566557010² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3328327841 + ... + 3328327860.

Almost surely, 2^66566557010 is an apocalyptic number.

66566557010 is a deficient number, since it is larger than the sum of its proper divisors (53253245626).

66566557010 is a wasteful number, since it uses less digits than its factorization.

66566557010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6656655708.

The product of its (nonzero) digits is 1134000, while the sum is 47.

The spelling of 66566557010 in words is "sixty-six billion, five hundred sixty-six million, five hundred fifty-seven thousand, ten".