66851053600 has 72 divisors (see below), whose sum is σ = 168464717568. Its totient is φ = 25877817600.

The previous prime is 66851053583. The next prime is 66851053603. The reversal of 66851053600 is 635015866.

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 (66851053603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1323004 + ... + 1372603.

It is an arithmetic number, because the mean of its divisors is an integer number (2339787744).

Almost surely, 2^66851053600 is an apocalyptic number.

It is an amenable number.

66851053600 is an abundant number, since it is smaller than the sum of its proper divisors (101613663968).

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

66851053600 is a wasteful number, since it uses less digits than its factorization.

66851053600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2695658 (or 2695645 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 40.

The spelling of 66851053600 in words is "sixty-six billion, eight hundred fifty-one million, fifty-three thousand, six hundred".