66654404 has 12 divisors (see below), whose sum is σ = 116925228. Its totient is φ = 33247200.

The previous prime is 66654403. The next prime is 66654407. The reversal of 66654404 is 40445666.

It can be written as a sum of positive squares in 2 ways, for example, as 16386304 + 50268100 = 4048^2 + 7090^2 .

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (66654403) 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, 18107 + ... + 21474.

It is an arithmetic number, because the mean of its divisors is an integer number (9743769).

Almost surely, 2^66654404 is an apocalyptic number.

It is an amenable number.

66654404 is a deficient number, since it is larger than the sum of its proper divisors (50270824).

66654404 is a wasteful number, since it uses less digits than its factorization.

66654404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40006 (or 40004 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 35.

The square root of 66654404 is about 8164.2148428370. The cubic root of 66654404 is about 405.4552701752.

The spelling of 66654404 in words is "sixty-six million, six hundred fifty-four thousand, four hundred four".