66667279394 has 16 divisors (see below), whose sum is σ = 102807396096. Its totient is φ = 32399967600.

The previous prime is 66667279381. The next prime is 66667279397. The reversal of 66667279394 is 49397276666.

It is a super-2 number, since 2×66667279394² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66667279394.

It is not an unprimeable number, because it can be changed into a prime (66667279397) 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 7 ways as a sum of consecutive naturals, for example, 381212 + ... + 527879.

It is an arithmetic number, because the mean of its divisors is an integer number (6425462256).

Almost surely, 2^66667279394 is an apocalyptic number.

66667279394 is a deficient number, since it is larger than the sum of its proper divisors (36140116702).

66667279394 is a wasteful number, since it uses less digits than its factorization.

66667279394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910121.

The product of its digits is 123451776, while the sum is 65.

The spelling of 66667279394 in words is "sixty-six billion, six hundred sixty-seven million, two hundred seventy-nine thousand, three hundred ninety-four".