671397811200 has 528 divisors, whose sum is σ = 2500469781120. Its totient is φ = 176504832000.

The previous prime is 671397811199. The next prime is 671397811207. The reversal of 671397811200 is 2118793176.

671397811200 is a `hidden beast` number, since 67 + 1 + 397 + 81 + 120 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671397811207) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 49068360 + ... + 49082040.

Almost surely, 2^671397811200 is an apocalyptic number.

671397811200 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671397811200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1250234890560).

671397811200 is an abundant number, since it is smaller than the sum of its proper divisors (1829071969920).

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

671397811200 is a wasteful number, since it uses less digits than its factorization.

671397811200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13791 (or 13762 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The spelling of 671397811200 in words is "six hundred seventy-one billion, three hundred ninety-seven million, eight hundred eleven thousand, two hundred".