66642646440200 has 48 divisors (see below), whose sum is σ = 157867627582980. Its totient is φ = 26154095202560.

The previous prime is 66642646440197. The next prime is 66642646440211. The reversal of 66642646440200 is 204464624666.

It can be written as a sum of positive squares in 6 ways, for example, as 14043861180196 + 52598785260004 = 3747514^2 + 7252502^2 .

It is a Harshad number since it is a multiple of its sum of digits (50).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3143510459 + ... + 3143531658.

Almost surely, 2^{66642646440200} is an apocalyptic number.

It is an amenable number.

66642646440200 is an abundant number, since it is smaller than the sum of its proper divisors (91224981142780).

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

66642646440200 is a wasteful number, since it uses less digits than its factorization.

66642646440200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6287042186 (or 6287042177 counting only the distinct ones).

The product of its (nonzero) digits is 7962624, while the sum is 50.

The spelling of 66642646440200 in words is "sixty-six trillion, six hundred forty-two billion, six hundred forty-six million, four hundred forty thousand, two hundred".