667216216644 has 24 divisors (see below), whose sum is σ = 1556879059008. Its totient is φ = 222399516960.

The previous prime is 667216216621. The next prime is 667216216649. The reversal of 667216216644 is 446612612766.

It is not an unprimeable number, because it can be changed into a prime (667216216649) 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, 251187 + ... + 1182170.

It is an arithmetic number, because the mean of its divisors is an integer number (64869960792).

Almost surely, 2^667216216644 is an apocalyptic number.

It is an amenable number.

667216216644 is an abundant number, since it is smaller than the sum of its proper divisors (889662842364).

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

667216216644 is a wasteful number, since it uses less digits than its factorization.

667216216644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1472155 (or 1472153 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 51.

The spelling of 667216216644 in words is "six hundred sixty-seven billion, two hundred sixteen million, two hundred sixteen thousand, six hundred forty-four".