671686245888 has 320 divisors, whose sum is σ = 2068628170752. Its totient is φ = 189710991360.

The previous prime is 671686245833. The next prime is 671686245889. The reversal of 671686245888 is 888542686176.

It is a super-2 number, since 2×671686245888² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (69) 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 (671686245889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 358997593 + ... + 358999463.

Almost surely, 2^671686245888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671686245888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1034314085376).

671686245888 is an abundant number, since it is smaller than the sum of its proper divisors (1396941924864).

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

671686245888 is a wasteful number, since it uses less digits than its factorization.

671686245888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2265 (or 2249 counting only the distinct ones).

The product of its digits is 247726080, while the sum is 69.

The spelling of 671686245888 in words is "six hundred seventy-one billion, six hundred eighty-six million, two hundred forty-five thousand, eight hundred eighty-eight".