671443701632 has 96 divisors (see below), whose sum is σ = 1469860749000. Its totient is φ = 302983895040.

The previous prime is 671443701589. The next prime is 671443701653. The reversal of 671443701632 is 236107344176.

It is a happy number.

It is a super-2 number, since 2×671443701632² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 375316994 + ... + 375318782.

Almost surely, 2^671443701632 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 671443701632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (734930374500).

671443701632 is an abundant number, since it is smaller than the sum of its proper divisors (798417047368).

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

671443701632 is an equidigital number, since it uses as much as digits as its factorization.

671443701632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3752 (or 1951 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 44.

The spelling of 671443701632 in words is "six hundred seventy-one billion, four hundred forty-three million, seven hundred one thousand, six hundred thirty-two".