660660620540 has 24 divisors (see below), whose sum is σ = 1395695018592. Its totient is φ = 262681826240.

The previous prime is 660660620527. The next prime is 660660620549. The reversal of 660660620540 is 45026066066.

660660620540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660660620549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98897951 + ... + 98904630.

It is an arithmetic number, because the mean of its divisors is an integer number (58153959108).

Almost surely, 2^660660620540 is an apocalyptic number.

It is an amenable number.

660660620540 is an abundant number, since it is smaller than the sum of its proper divisors (735034398052).

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

660660620540 is a wasteful number, since it uses less digits than its factorization.

660660620540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197802757 (or 197802755 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 41.

The spelling of 660660620540 in words is "six hundred sixty billion, six hundred sixty million, six hundred twenty thousand, five hundred forty".