66678826032 has 720 divisors, whose sum is σ = 244514350080. Its totient is φ = 16794086400.

The previous prime is 66678826013. The next prime is 66678826033. The reversal of 66678826032 is 23062887666.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 66678826032.

It is not an unprimeable number, because it can be changed into a prime (66678826033) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 372507319 + ... + 372507497.

It is an arithmetic number, because the mean of its divisors is an integer number (339603264).

Almost surely, 2^66678826032 is an apocalyptic number.

66678826032 is a gapful number since it is divisible by the number (62) 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 66678826032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122257175040).

66678826032 is an abundant number, since it is smaller than the sum of its proper divisors (177835524048).

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

66678826032 is a wasteful number, since it uses less digits than its factorization.

66678826032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382 (or 366 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 54.

The spelling of 66678826032 in words is "sixty-six billion, six hundred seventy-eight million, eight hundred twenty-six thousand, thirty-two".