66226662400 has 66 divisors (see below), whose sum is σ = 164161989860. Its totient is φ = 26490654720.

The previous prime is 66226662373. The next prime is 66226662401. The reversal of 66226662400 is 426662266.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (66226662401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1267890 + ... + 1319089.

Almost surely, 2^66226662400 is an apocalyptic number.

It is an amenable number.

66226662400 is an abundant number, since it is smaller than the sum of its proper divisors (97935327460).

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

66226662400 is a wasteful number, since it uses less digits than its factorization.

66226662400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2587009 (or 2586986 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 40.

The spelling of 66226662400 in words is "sixty-six billion, two hundred twenty-six million, six hundred sixty-two thousand, four hundred".