66326761400 has 96 divisors (see below), whose sum is σ = 163462283280. Its totient is φ = 24942336000.

The previous prime is 66326761393. The next prime is 66326761409. The reversal of 66326761400 is 416762366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66326761409) 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 23 ways as a sum of consecutive naturals, for example, 3189035 + ... + 3209765.

Almost surely, 2^66326761400 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 66326761400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81731141640).

66326761400 is an abundant number, since it is smaller than the sum of its proper divisors (97135521880).

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

66326761400 is a wasteful number, since it uses less digits than its factorization.

66326761400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21705 (or 21696 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 41.

The spelling of 66326761400 in words is "sixty-six billion, three hundred twenty-six million, seven hundred sixty-one thousand, four hundred".