671649800536 has 64 divisors (see below), whose sum is σ = 1510987322880. Its totient is φ = 275815102080.

The previous prime is 671649800461. The next prime is 671649800537. The reversal of 671649800536 is 635008946176.

It is a super-2 number, since 2×671649800536² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671649800537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6192046 + ... + 6299581.

It is an arithmetic number, because the mean of its divisors is an integer number (23609176920).

Almost surely, 2^671649800536 is an apocalyptic number.

It is an amenable number.

671649800536 is an abundant number, since it is smaller than the sum of its proper divisors (839337522344).

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

671649800536 is a wasteful number, since it uses less digits than its factorization.

671649800536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12491704 (or 12491700 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 55.

The spelling of 671649800536 in words is "six hundred seventy-one billion, six hundred forty-nine million, eight hundred thousand, five hundred thirty-six".