66785421336 has 32 divisors (see below), whose sum is σ = 167223255360. Its totient is φ = 22227180192.

The previous prime is 66785421301. The next prime is 66785421337. The reversal of 66785421336 is 63312458766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66785421337) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2148430 + ... + 2179293.

It is an arithmetic number, because the mean of its divisors is an integer number (5225726730).

Almost surely, 2^66785421336 is an apocalyptic number.

It is an amenable number.

66785421336 is an abundant number, since it is smaller than the sum of its proper divisors (100437834024).

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

66785421336 is a wasteful number, since it uses less digits than its factorization.

66785421336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4328375 (or 4328371 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 51.

The spelling of 66785421336 in words is "sixty-six billion, seven hundred eighty-five million, four hundred twenty-one thousand, three hundred thirty-six".