671986355040 has 2880 divisors, whose sum is σ = 3409291492992. Its totient is φ = 120872632320.

The previous prime is 671986355017. The next prime is 671986355083. The reversal of 671986355040 is 40553689176.

671986355040 is a `hidden beast` number, since 6 + 7 + 1 + 9 + 86 + 3 + 550 + 4 + 0 = 666.

It is a super-2 number, since 2×671986355040² (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 479 ways as a sum of consecutive naturals, for example, 2425943382 + ... + 2425943658.

Almost surely, 2^671986355040 is an apocalyptic number.

671986355040 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 671986355040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1704645746496).

671986355040 is an abundant number, since it is smaller than the sum of its proper divisors (2737305137952).

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

671986355040 is a wasteful number, since it uses less digits than its factorization.

671986355040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363 (or 335 counting only the distinct ones).

The product of its (nonzero) digits is 5443200, while the sum is 54.

The spelling of 671986355040 in words is "six hundred seventy-one billion, nine hundred eighty-six million, three hundred fifty-five thousand, forty".