66793972278 has 32 divisors (see below), whose sum is σ = 149671019520. Its totient is φ = 19693553760.

The previous prime is 66793972261. The next prime is 66793972279. The reversal of 66793972278 is 87227939766.

It is a super-2 number, since 2×66793972278² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66793972279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13673638 + ... + 13678521.

It is an arithmetic number, because the mean of its divisors is an integer number (4677219360).

Almost surely, 2^66793972278 is an apocalyptic number.

66793972278 is an abundant number, since it is smaller than the sum of its proper divisors (82877047242).

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

66793972278 is a wasteful number, since it uses less digits than its factorization.

66793972278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27352212.

The product of its digits is 96018048, while the sum is 66.

The spelling of 66793972278 in words is "sixty-six billion, seven hundred ninety-three million, nine hundred seventy-two thousand, two hundred seventy-eight".