671453534640 has 1280 divisors, whose sum is σ = 2664972288000. Its totient is φ = 139403980800.

The previous prime is 671453534629. The next prime is 671453534641. The reversal of 671453534640 is 46435354176.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 671453534640.

It is not an unprimeable number, because it can be changed into a prime (671453534641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 3182244135 + ... + 3182244345.

It is an arithmetic number, because the mean of its divisors is an integer number (2082009600).

Almost surely, 2^671453534640 is an apocalyptic number.

671453534640 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 671453534640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1332486144000).

671453534640 is an abundant number, since it is smaller than the sum of its proper divisors (1993518753360).

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

671453534640 is a wasteful number, since it uses less digits than its factorization.

671453534640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351 (or 331 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 48.

The spelling of 671453534640 in words is "six hundred seventy-one billion, four hundred fifty-three million, five hundred thirty-four thousand, six hundred forty".