66900440600 has 192 divisors, whose sum is σ = 183715741440. Its totient is φ = 22180032000.

The previous prime is 66900440591. The next prime is 66900440611. The reversal of 66900440600 is 604400966.

It is a Harshad number since it is a multiple of its sum of digits (35).

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 47 ways as a sum of consecutive naturals, for example, 6074699 + ... + 6085701.

It is an arithmetic number, because the mean of its divisors is an integer number (956852820).

Almost surely, 2^66900440600 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 66900440600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91857870720).

66900440600 is an abundant number, since it is smaller than the sum of its proper divisors (116815300840).

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

66900440600 is a wasteful number, since it uses less digits than its factorization.

66900440600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11170 (or 11161 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 35.

The spelling of 66900440600 in words is "sixty-six billion, nine hundred million, four hundred forty thousand, six hundred".