660487544640 has 1344 divisors, whose sum is σ = 2941414414848. Its totient is φ = 132046848000.

The previous prime is 660487544609. The next prime is 660487544659. The reversal of 660487544640 is 46445784066.

It is a happy number.

660487544640 is a `hidden beast` number, since 6 + 60 + 487 + 5 + 44 + 64 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1344).

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 828716722 + ... + 828717518.

It is an arithmetic number, because the mean of its divisors is an integer number (2188552392).

Almost surely, 2^660487544640 is an apocalyptic number.

660487544640 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 660487544640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1470707207424).

660487544640 is an abundant number, since it is smaller than the sum of its proper divisors (2280926870208).

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

660487544640 is a wasteful number, since it uses less digits than its factorization.

660487544640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976 (or 963 counting only the distinct ones).

The product of its (nonzero) digits is 15482880, while the sum is 54.

The spelling of 660487544640 in words is "six hundred sixty billion, four hundred eighty-seven million, five hundred forty-four thousand, six hundred forty".