66697279400 has 24 divisors (see below), whose sum is σ = 155071175070. Its totient is φ = 26678911680.

The previous prime is 66697279393. The next prime is 66697279447. The reversal of 66697279400 is 497279666.

It can be written as a sum of positive squares in 3 ways, for example, as 54194908804 + 12502370596 = 232798^2 + 111814^2 .

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 5 ways as a sum of consecutive naturals, for example, 166742999 + ... + 166743398.

Almost surely, 2^66697279400 is an apocalyptic number.

It is an amenable number.

66697279400 is an abundant number, since it is smaller than the sum of its proper divisors (88373895670).

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

66697279400 is a wasteful number, since it uses less digits than its factorization.

66697279400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333486413 (or 333486404 counting only the distinct ones).

The product of its (nonzero) digits is 6858432, while the sum is 56.

The spelling of 66697279400 in words is "sixty-six billion, six hundred ninety-seven million, two hundred seventy-nine thousand, four hundred".