66402418 has 8 divisors (see below), whose sum is σ = 99722160. Its totient is φ = 33161700.

The previous prime is 66402409. The next prime is 66402419. The reversal of 66402418 is 81420466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×66402418² = 8818562232493448, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66402418.

It is not an unprimeable number, because it can be changed into a prime (66402419) 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, 17608 + ... + 21043.

It is an arithmetic number, because the mean of its divisors is an integer number (12465270).

Almost surely, 2^66402418 is an apocalyptic number.

66402418 is a deficient number, since it is larger than the sum of its proper divisors (33319742).

66402418 is a wasteful number, since it uses less digits than its factorization.

66402418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39512.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 66402418 is about 8148.7678823243. The cubic root of 66402418 is about 404.9436857126.

The spelling of 66402418 in words is "sixty-six million, four hundred two thousand, four hundred eighteen".