640173754080 has 480 divisors, whose sum is σ = 2589956328960. Its totient is φ = 145876515840.

The previous prime is 640173754069. The next prime is 640173754163. The reversal of 640173754080 is 80457371046.

640173754080 is a `hidden beast` number, since 6 + 4 + 0 + 173 + 75 + 408 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (480).

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 polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 30017661 + ... + 30038979.

It is an arithmetic number, because the mean of its divisors is an integer number (5395742352).

Almost surely, 2^640173754080 is an apocalyptic number.

640173754080 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 640173754080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1294978164480).

640173754080 is an abundant number, since it is smaller than the sum of its proper divisors (1949782574880).

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

640173754080 is a wasteful number, since it uses less digits than its factorization.

640173754080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21684 (or 21667 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 45.

The spelling of 640173754080 in words is "six hundred forty billion, one hundred seventy-three million, seven hundred fifty-four thousand, eighty".