671138081460 has 576 divisors, whose sum is σ = 2654467200000. Its totient is φ = 139205848320.

The previous prime is 671138081447. The next prime is 671138081527. The reversal of 671138081460 is 64180831176.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

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 191 ways as a sum of consecutive naturals, for example, 191806791 + ... + 191810289.

It is an arithmetic number, because the mean of its divisors is an integer number (4608450000).

Almost surely, 2^671138081460 is an apocalyptic number.

671138081460 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 671138081460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1327233600000).

671138081460 is an abundant number, since it is smaller than the sum of its proper divisors (1983329118540).

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

671138081460 is a wasteful number, since it uses less digits than its factorization.

671138081460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4201 (or 4186 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The spelling of 671138081460 in words is "six hundred seventy-one billion, one hundred thirty-eight million, eighty-one thousand, four hundred sixty".