671097315840 has 640 divisors, whose sum is σ = 2592691200000. Its totient is φ = 144659644416.

The previous prime is 671097315839. The next prime is 671097315893. The reversal of 671097315840 is 48513790176.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (640).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 244122786 + ... + 244125534.

It is an arithmetic number, because the mean of its divisors is an integer number (4051080000).

Almost surely, 2^671097315840 is an apocalyptic number.

671097315840 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 671097315840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1296345600000).

671097315840 is an abundant number, since it is smaller than the sum of its proper divisors (1921593884160).

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

671097315840 is a wasteful number, since it uses less digits than its factorization.

671097315840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3040 (or 3024 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 51.

The spelling of 671097315840 in words is "six hundred seventy-one billion, ninety-seven million, three hundred fifteen thousand, eight hundred forty".