66641531264080 has 40 divisors (see below), whose sum is σ = 156056247698400. Its totient is φ = 26464838310528.

The previous prime is 66641531264059. The next prime is 66641531264107. The reversal of 66641531264080 is 8046213514666.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2996460610 + ... + 2996482849.

It is an arithmetic number, because the mean of its divisors is an integer number (3901406192460).

Almost surely, 2^{66641531264080} is an apocalyptic number.

It is an amenable number.

66641531264080 is an abundant number, since it is smaller than the sum of its proper divisors (89414716434320).

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

66641531264080 is a wasteful number, since it uses less digits than its factorization.

66641531264080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5992943611 (or 5992943605 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 52.

The spelling of 66641531264080 in words is "sixty-six trillion, six hundred forty-one billion, five hundred thirty-one million, two hundred sixty-four thousand, eighty".