66555617000 has 32 divisors (see below), whose sum is σ = 155740146120. Its totient is φ = 26622246400.

The previous prime is 66555616999. The next prime is 66555617003. The reversal of 66555617000 is 71655566.

It can be written as a sum of positive squares in 4 ways, for example, as 16452166756 + 50103450244 = 128266^2 + 223838^2 .

It is not an unprimeable number, because it can be changed into a prime (66555617003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33276809 + ... + 33278808.

Almost surely, 2^66555617000 is an apocalyptic number.

It is an amenable number.

66555617000 is an abundant number, since it is smaller than the sum of its proper divisors (89184529120).

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

66555617000 is a wasteful number, since it uses less digits than its factorization.

66555617000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66555638 (or 66555624 counting only the distinct ones).

The product of its (nonzero) digits is 189000, while the sum is 41.

The spelling of 66555617000 in words is "sixty-six billion, five hundred fifty-five million, six hundred seventeen thousand".