66401404 has 12 divisors (see below), whose sum is σ = 116268264. Its totient is φ = 33181904.

The previous prime is 66401389. The next prime is 66401407. The reversal of 66401404 is 40410466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66401407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5907 + ... + 12949.

It is an arithmetic number, because the mean of its divisors is an integer number (9689022).

Almost surely, 2^66401404 is an apocalyptic number.

It is an amenable number.

66401404 is a deficient number, since it is larger than the sum of its proper divisors (49866860).

66401404 is a wasteful number, since it uses less digits than its factorization.

66401404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9404 (or 9402 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 66401404 is about 8148.7056640917. The cubic root of 66401404 is about 404.9416244675.

The spelling of 66401404 in words is "sixty-six million, four hundred one thousand, four hundred four".