66168404 has 6 divisors (see below), whose sum is σ = 115794714. Its totient is φ = 33084200.

The previous prime is 66168373. The next prime is 66168409. The reversal of 66168404 is 40486166.

It can be written as a sum of positive squares in only one way, i.e., 34245904 + 31922500 = 5852^2 + 5650^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66168409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8271047 + ... + 8271054.

It is an arithmetic number, because the mean of its divisors is an integer number (19299119).

Almost surely, 2^66168404 is an apocalyptic number.

It is an amenable number.

66168404 is a deficient number, since it is larger than the sum of its proper divisors (49626310).

66168404 is a wasteful number, since it uses less digits than its factorization.

66168404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16542105 (or 16542103 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 66168404 is about 8134.3963512974. The cubic root of 66168404 is about 404.4674278043.

The spelling of 66168404 in words is "sixty-six million, one hundred sixty-eight thousand, four hundred four".