671006418420 has 144 divisors (see below), whose sum is σ = 2067813401472. Its totient is φ = 162462942720.

The previous prime is 671006418403. The next prime is 671006418421. The reversal of 671006418420 is 24814600176.

It is a super-2 number, since 2×671006418420² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671006418421) 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, 76129 + ... + 1160951.

It is an arithmetic number, because the mean of its divisors is an integer number (14359815288).

Almost surely, 2^671006418420 is an apocalyptic number.

671006418420 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 671006418420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1033906700736).

671006418420 is an abundant number, since it is smaller than the sum of its proper divisors (1396806983052).

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

671006418420 is a wasteful number, since it uses less digits than its factorization.

671006418420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1084922 (or 1084907 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

The spelling of 671006418420 in words is "six hundred seventy-one billion, six million, four hundred eighteen thousand, four hundred twenty".