66005510612 has 18 divisors (see below), whose sum is σ = 117500641818. Its totient is φ = 32443379728.

The previous prime is 66005510573. The next prime is 66005510633. The reversal of 66005510612 is 21601550066.

It can be written as a sum of positive squares in only one way, i.e., 41817796036 + 24187714576 = 204494^2 + 155524^2 .

It is a super-2 number, since 2×66005510612² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2356283 + ... + 2384130.

Almost surely, 2^66005510612 is an apocalyptic number.

It is an amenable number.

66005510612 is a deficient number, since it is larger than the sum of its proper divisors (51495131206).

66005510612 is a wasteful number, since it uses less digits than its factorization.

66005510612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4740535 (or 4740474 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

The spelling of 66005510612 in words is "sixty-six billion, five million, five hundred ten thousand, six hundred twelve".