671166557521216 has 28 divisors (see below), whose sum is σ = 1360183289450688. Its totient is φ = 328443208998272.

The previous prime is 671166557521087. The next prime is 671166557521219. The reversal of 671166557521216 is 612125755661176.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671166557521219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111563587006 + ... + 111563593021.

Almost surely, 2^{671166557521216} is an apocalyptic number.

It is an amenable number.

671166557521216 is an abundant number, since it is smaller than the sum of its proper divisors (689016731929472).

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

671166557521216 is a wasteful number, since it uses less digits than its factorization.

671166557521216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223127180086 (or 223127180076 counting only the distinct ones).

The product of its digits is 31752000, while the sum is 61.

The spelling of 671166557521216 in words is "six hundred seventy-one trillion, one hundred sixty-six billion, five hundred fifty-seven million, five hundred twenty-one thousand, two hundred sixteen".