66126466660 has 12 divisors (see below), whose sum is σ = 138865580028. Its totient is φ = 26450586656.

The previous prime is 66126466621. The next prime is 66126466697. The reversal of 66126466660 is 6666462166.

It can be written as a sum of positive squares in 2 ways, for example, as 38205393444 + 27921073216 = 195462^2 + 167096^2 .

It is a super-3 number, since 3×66126466660³ (a number of 33 digits) contains 333 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, 1653161647 + ... + 1653161686.

It is an arithmetic number, because the mean of its divisors is an integer number (11572131669).

Almost surely, 2^66126466660 is an apocalyptic number.

It is an amenable number.

66126466660 is an abundant number, since it is smaller than the sum of its proper divisors (72739113368).

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

66126466660 is a wasteful number, since it uses less digits than its factorization.

66126466660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3306323342 (or 3306323340 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 49.

The spelling of 66126466660 in words is "sixty-six billion, one hundred twenty-six million, four hundred sixty-six thousand, six hundred sixty".