66654452 has 6 divisors (see below), whose sum is σ = 116645298. Its totient is φ = 33327224.

The previous prime is 66654421. The next prime is 66654487. The reversal of 66654452 is 25445666.

It can be written as a sum of positive squares in only one way, i.e., 65869456 + 784996 = 8116^2 + 886^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8331803 + ... + 8331810.

It is an arithmetic number, because the mean of its divisors is an integer number (19440883).

Almost surely, 2^66654452 is an apocalyptic number.

It is an amenable number.

66654452 is a deficient number, since it is larger than the sum of its proper divisors (49990846).

66654452 is a wasteful number, since it uses less digits than its factorization.

66654452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16663617 (or 16663615 counting only the distinct ones).

The product of its digits is 172800, while the sum is 38.

The square root of 66654452 is about 8164.2177824945. The cubic root of 66654452 is about 405.4553675023.

The spelling of 66654452 in words is "sixty-six million, six hundred fifty-four thousand, four hundred fifty-two".