66501576240 has 640 divisors, whose sum is σ = 251469619200. Its totient is φ = 14346731520.

The previous prime is 66501576227. The next prime is 66501576277. The reversal of 66501576240 is 4267510566.

It is a junction number, because it is equal to n+sod(n) for n = 66501576192 and 66501576201.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 68066632 + ... + 68067608.

It is an arithmetic number, because the mean of its divisors is an integer number (392921280).

Almost surely, 2^66501576240 is an apocalyptic number.

66501576240 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 66501576240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125734809600).

66501576240 is an abundant number, since it is smaller than the sum of its proper divisors (184968042960).

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

66501576240 is a wasteful number, since it uses less digits than its factorization.

66501576240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105 (or 1099 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 42.

The spelling of 66501576240 in words is "sixty-six billion, five hundred one million, five hundred seventy-six thousand, two hundred forty".