671681418045 has 64 divisors (see below), whose sum is σ = 1223862220800. Its totient is φ = 311377271040.

The previous prime is 671681417989. The next prime is 671681418127. The reversal of 671681418045 is 540814186176.

671681418045 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 671681418045 - 2²⁸ = 671412982589 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9600651 + ... + 9670359.

It is an arithmetic number, because the mean of its divisors is an integer number (19122847200).

Almost surely, 2^671681418045 is an apocalyptic number.

It is an amenable number.

671681418045 is a deficient number, since it is larger than the sum of its proper divisors (552180802755).

671681418045 is a wasteful number, since it uses less digits than its factorization.

671681418045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72290.

The product of its (nonzero) digits is 1290240, while the sum is 51.

The spelling of 671681418045 in words is "six hundred seventy-one billion, six hundred eighty-one million, four hundred eighteen thousand, forty-five".