66620311336700 has 72 divisors (see below), whose sum is σ = 157763232506880. Its totient is φ = 24217152030400.

The previous prime is 66620311336699. The next prime is 66620311336703. The reversal of 66620311336700 is 763311302666.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66620311336703) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7351322 + ... + 13685121.

It is an arithmetic number, because the mean of its divisors is an integer number (2191156007040).

Almost surely, 2^{66620311336700} is an apocalyptic number.

It is an amenable number.

66620311336700 is an abundant number, since it is smaller than the sum of its proper divisors (91142921170180).

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

66620311336700 is a wasteful number, since it uses less digits than its factorization.

66620311336700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21039347 (or 21039340 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 44.

The spelling of 66620311336700 in words is "sixty-six trillion, six hundred twenty billion, three hundred eleven million, three hundred thirty-six thousand, seven hundred".