671618087616 has 84 divisors (see below), whose sum is σ = 2067110290968. Its totient is φ = 191890879488.

The previous prime is 671618087611. The next prime is 671618087653. The reversal of 671618087616 is 616780816176.

It is a tau number, because it is divible by the number of its divisors (84).

It is a super-2 number, since 2×671618087616² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (671618087611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35684581 + ... + 35703396.

Almost surely, 2^671618087616 is an apocalyptic number.

It is an amenable number.

671618087616 is an abundant number, since it is smaller than the sum of its proper divisors (1395492203352).

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

671618087616 is a wasteful number, since it uses less digits than its factorization.

671618087616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71388006 (or 71387989 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 57.

The spelling of 671618087616 in words is "six hundred seventy-one billion, six hundred eighteen million, eighty-seven thousand, six hundred sixteen".