66120352440 has 64 divisors (see below), whose sum is σ = 198561576960. Its totient is φ = 17614270080.

The previous prime is 66120352439. The next prime is 66120352447. The reversal of 66120352440 is 4425302166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66120352447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159084 + ... + 396923.

It is an arithmetic number, because the mean of its divisors is an integer number (3102524640).

Almost surely, 2^66120352440 is an apocalyptic number.

66120352440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66120352440 is an abundant number, since it is smaller than the sum of its proper divisors (132441224520).

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

66120352440 is a wasteful number, since it uses less digits than its factorization.

66120352440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557012 (or 557008 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

The spelling of 66120352440 in words is "sixty-six billion, one hundred twenty million, three hundred fifty-two thousand, four hundred forty".