66013732560 has 40 divisors (see below), whose sum is σ = 204642571680. Its totient is φ = 17603661952.

The previous prime is 66013732559. The next prime is 66013732567. The reversal of 66013732560 is 6523731066.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66013732567) 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, 137528370 + ... + 137528849.

It is an arithmetic number, because the mean of its divisors is an integer number (5116064292).

Almost surely, 2^66013732560 is an apocalyptic number.

66013732560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66013732560 is an abundant number, since it is smaller than the sum of its proper divisors (138628839120).

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

66013732560 is a wasteful number, since it uses less digits than its factorization.

66013732560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275057235 (or 275057229 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 39.

The spelling of 66013732560 in words is "sixty-six billion, thirteen million, seven hundred thirty-two thousand, five hundred sixty".