66354172 has 48 divisors (see below), whose sum is σ = 126326592. Its totient is φ = 30412800.

The previous prime is 66354163. The next prime is 66354193. The reversal of 66354172 is 27145366.

It is a happy number.

It is a super-3 number, since 3×66354172³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 343708 + ... + 343900.

It is an arithmetic number, because the mean of its divisors is an integer number (2631804).

Almost surely, 2^66354172 is an apocalyptic number.

It is an amenable number.

66354172 is a deficient number, since it is larger than the sum of its proper divisors (59972420).

66354172 is a wasteful number, since it uses less digits than its factorization.

66354172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358 (or 356 counting only the distinct ones).

The product of its digits is 30240, while the sum is 34.

The square root of 66354172 is about 8145.8070195653. The cubic root of 66354172 is about 404.8455886493.

The spelling of 66354172 in words is "sixty-six million, three hundred fifty-four thousand, one hundred seventy-two".