671681536989 has 16 divisors (see below), whose sum is σ = 909064108032. Its totient is φ = 441045121968.

The previous prime is 671681536913. The next prime is 671681536993. The reversal of 671681536989 is 989635186176.

It is not a de Polignac number, because 671681536989 - 2⁸ = 671681536733 is a prime.

It is a super-2 number, since 2×671681536989² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671681536289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1303842 + ... + 1744524.

It is an arithmetic number, because the mean of its divisors is an integer number (56816506752).

Almost surely, 2^671681536989 is an apocalyptic number.

It is an amenable number.

671681536989 is a deficient number, since it is larger than the sum of its proper divisors (237382571043).

671681536989 is a wasteful number, since it uses less digits than its factorization.

671681536989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448336.

The product of its digits is 117573120, while the sum is 69.

The spelling of 671681536989 in words is "six hundred seventy-one billion, six hundred eighty-one million, five hundred thirty-six thousand, nine hundred eighty-nine".