66826562400 has 432 divisors, whose sum is σ = 258096449520. Its totient is φ = 16169472000.

The previous prime is 66826562389. The next prime is 66826562479. The reversal of 66826562400 is 426562866.

66826562400 is a `hidden beast` number, since 6 + 6 + 82 + 6 + 562 + 4 + 0 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

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 71 ways as a sum of consecutive naturals, for example, 5516350 + ... + 5528450.

It is an arithmetic number, because the mean of its divisors is an integer number (597445485).

Almost surely, 2^66826562400 is an apocalyptic number.

66826562400 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 66826562400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129048224760).

66826562400 is an abundant number, since it is smaller than the sum of its proper divisors (191269887120).

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

66826562400 is a wasteful number, since it uses less digits than its factorization.

66826562400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12199 (or 12183 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 45.

The spelling of 66826562400 in words is "sixty-six billion, eight hundred twenty-six million, five hundred sixty-two thousand, four hundred".