671491954800 has 480 divisors, whose sum is σ = 2471122472960. Its totient is φ = 173006668800.

The previous prime is 671491954781. The next prime is 671491954841. The reversal of 671491954800 is 8459194176.

671491954800 is a `hidden beast` number, since 6 + 7 + 1 + 4 + 91 + 9 + 548 + 0 + 0 = 666.

It is a super-2 number, since 2×671491954800² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 275539182 + ... + 275541618.

Almost surely, 2^671491954800 is an apocalyptic number.

671491954800 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 671491954800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1235561236480).

671491954800 is an abundant number, since it is smaller than the sum of its proper divisors (1799630518160).

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

671491954800 is a wasteful number, since it uses less digits than its factorization.

671491954800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3318 (or 3301 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The spelling of 671491954800 in words is "six hundred seventy-one billion, four hundred ninety-one million, nine hundred fifty-four thousand, eight hundred".