66425659020 has 144 divisors (see below), whose sum is σ = 231282192960. Its totient is φ = 15116640768.

The previous prime is 66425658973. The next prime is 66425659037. The reversal of 66425659020 is 2095652466.

It is a happy number.

66425659020 is a `hidden beast` number, since 6 + 6 + 4 + 2 + 56 + 590 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 173434 + ... + 403646.

It is an arithmetic number, because the mean of its divisors is an integer number (1606126340).

Almost surely, 2^66425659020 is an apocalyptic number.

66425659020 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 66425659020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115641096480).

66425659020 is an abundant number, since it is smaller than the sum of its proper divisors (164856533940).

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

66425659020 is a wasteful number, since it uses less digits than its factorization.

66425659020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230464 (or 230459 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 66425659020 in words is "sixty-six billion, four hundred twenty-five million, six hundred fifty-nine thousand, twenty".