66651609024 has 1344 divisors, whose sum is σ = 276050288640. Its totient is φ = 15328051200.

The previous prime is 66651608983. The next prime is 66651609049. The reversal of 66651609024 is 42090615666.

It is a tau number, because it is divible by the number of its divisors (1344).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 589837192 + ... + 589837304.

It is an arithmetic number, because the mean of its divisors is an integer number (205394560).

Almost surely, 2^66651609024 is an apocalyptic number.

66651609024 is a gapful number since it is divisible by the number (64) 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 66651609024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138025144320).

66651609024 is an abundant number, since it is smaller than the sum of its proper divisors (209398679616).

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

66651609024 is a wasteful number, since it uses less digits than its factorization.

66651609024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207 (or 180 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 66651609024 in words is "sixty-six billion, six hundred fifty-one million, six hundred nine thousand, twenty-four".