66378738428 has 12 divisors (see below), whose sum is σ = 122276623560. Its totient is φ = 31442560272.

The previous prime is 66378738397. The next prime is 66378738479. The reversal of 66378738428 is 82483787366.

It is a super-2 number, since 2×66378738428² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 436702151 + ... + 436702302.

It is an arithmetic number, because the mean of its divisors is an integer number (10189718630).

Almost surely, 2^66378738428 is an apocalyptic number.

It is an amenable number.

66378738428 is a deficient number, since it is larger than the sum of its proper divisors (55897885132).

66378738428 is a wasteful number, since it uses less digits than its factorization.

66378738428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 873404476 (or 873404474 counting only the distinct ones).

The product of its digits is 65028096, while the sum is 62.

The spelling of 66378738428 in words is "sixty-six billion, three hundred seventy-eight million, seven hundred thirty-eight thousand, four hundred twenty-eight".