671344778580 has 144 divisors (see below), whose sum is σ = 2219840219520. Its totient is φ = 148500138240.

The previous prime is 671344778543. The next prime is 671344778603. The reversal of 671344778580 is 85877443176.

It is a Harshad number since it is a multiple of its sum of digits (60).

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 47 ways as a sum of consecutive naturals, for example, 428035 + ... + 1235274.

It is an arithmetic number, because the mean of its divisors is an integer number (15415557080).

Almost surely, 2^671344778580 is an apocalyptic number.

671344778580 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

671344778580 is an abundant number, since it is smaller than the sum of its proper divisors (1548495440940).

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

671344778580 is a wasteful number, since it uses less digits than its factorization.

671344778580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1663390 (or 1663357 counting only the distinct ones).

The product of its (nonzero) digits is 31610880, while the sum is 60.

The spelling of 671344778580 in words is "six hundred seventy-one billion, three hundred forty-four million, seven hundred seventy-eight thousand, five hundred eighty".