66425104640 has 144 divisors (see below), whose sum is σ = 160919377920. Its totient is φ = 26269286400.

The previous prime is 66425104639. The next prime is 66425104643. The reversal of 66425104640 is 4640152466.

It is a junction number, because it is equal to n+sod(n) for n = 66425104594 and 66425104603.

It is not an unprimeable number, because it can be changed into a prime (66425104643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65186051 + ... + 65187069.

It is an arithmetic number, because the mean of its divisors is an integer number (1117495680).

Almost surely, 2^66425104640 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 66425104640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80459688960).

66425104640 is an abundant number, since it is smaller than the sum of its proper divisors (94494273280).

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

66425104640 is a wasteful number, since it uses less digits than its factorization.

66425104640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1568 (or 1554 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 38.

The spelling of 66425104640 in words is "sixty-six billion, four hundred twenty-five million, one hundred four thousand, six hundred forty".