66945346555200 has 84 divisors (see below), whose sum is σ = 219636524505600. Its totient is φ = 17852092413440.

The previous prime is 66945346555193. The next prime is 66945346555229. The reversal of 66945346555200 is 255564354966.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6973468800 + ... + 6973478399.

Almost surely, 2^{66945346555200} is an apocalyptic number.

66945346555200 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66945346555200 is an abundant number, since it is smaller than the sum of its proper divisors (152691177950400).

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

66945346555200 is a wasteful number, since it uses less digits than its factorization.

66945346555200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13946947224 (or 13946947209 counting only the distinct ones).

The product of its (nonzero) digits is 116640000, while the sum is 60.

The spelling of 66945346555200 in words is "sixty-six trillion, nine hundred forty-five billion, three hundred forty-six million, five hundred fifty-five thousand, two hundred".