66175722440 has 64 divisors (see below), whose sum is σ = 157159699200. Its totient is φ = 25008680448.

The previous prime is 66175722433. The next prime is 66175722479. The reversal of 66175722440 is 4422757166.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 66175722391 and 66175722400.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160292 + ... + 397548.

It is an arithmetic number, because the mean of its divisors is an integer number (2455620300).

Almost surely, 2^66175722440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66175722440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78579849600).

66175722440 is an abundant number, since it is smaller than the sum of its proper divisors (90983976760).

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

66175722440 is a wasteful number, since it uses less digits than its factorization.

66175722440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237654 (or 237650 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 44.

The spelling of 66175722440 in words is "sixty-six billion, one hundred seventy-five million, seven hundred twenty-two thousand, four hundred forty".