66428787373 has 8 divisors (see below), whose sum is σ = 75303888800. Its totient is φ = 58091570928.

The previous prime is 66428787371. The next prime is 66428787419. The reversal of 66428787373 is 37378782466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66428787373 - 2¹ = 66428787371 is a prime.

It is a super-2 number, since 2×66428787373² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66428787371) 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, 134470983 + ... + 134471476.

It is an arithmetic number, because the mean of its divisors is an integer number (9412986100).

Almost surely, 2^66428787373 is an apocalyptic number.

It is an amenable number.

66428787373 is a deficient number, since it is larger than the sum of its proper divisors (8875101427).

66428787373 is a wasteful number, since it uses less digits than its factorization.

66428787373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268942491.

The product of its digits is 56899584, while the sum is 61.

The spelling of 66428787373 in words is "sixty-six billion, four hundred twenty-eight million, seven hundred eighty-seven thousand, three hundred seventy-three".