66646601133640 has 32 divisors (see below), whose sum is σ = 163587111874560. Its totient is φ = 24235127684800.

The previous prime is 66646601133631. The next prime is 66646601133653. The reversal of 66646601133640 is 4633110664666.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75734773576 + ... + 75734774455.

It is an arithmetic number, because the mean of its divisors is an integer number (5112097246080).

Almost surely, 2^{66646601133640} is an apocalyptic number.

It is an amenable number.

66646601133640 is an abundant number, since it is smaller than the sum of its proper divisors (96940510740920).

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

66646601133640 is a wasteful number, since it uses less digits than its factorization.

66646601133640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151469548053 (or 151469548049 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 52.

The spelling of 66646601133640 in words is "sixty-six trillion, six hundred forty-six billion, six hundred one million, one hundred thirty-three thousand, six hundred forty".