78472338784666 has 8 divisors (see below), whose sum is σ = 117708864302304. Its totient is φ = 39236050683900.

The previous prime is 78472338784663. The next prime is 78472338784703. The reversal of 78472338784666 is 66648783327487.

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

It is a super-3 number, since 3×78472338784666³ (a number of 43 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (78472338784663) by changing a digit.

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, 58525590 + ... + 59851393.

It is an arithmetic number, because the mean of its divisors is an integer number (14713608037788).

Almost surely, 2^{78472338784666} is an apocalyptic number.

78472338784666 is a deficient number, since it is larger than the sum of its proper divisors (39236525517638).

78472338784666 is a wasteful number, since it uses less digits than its factorization.

78472338784666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118708436.

The product of its digits is 10924720128, while the sum is 79.

The spelling of 78472338784666 in words is "seventy-eight trillion, four hundred seventy-two billion, three hundred thirty-eight million, seven hundred eighty-four thousand, six hundred sixty-six".