66156414 has 16 divisors (see below), whose sum is σ = 133624080. Its totient is φ = 21833600.

The previous prime is 66156383. The next prime is 66156421. The reversal of 66156414 is 41465166.

It is a happy number.

It is a super-2 number, since 2×66156414² = 8753342226678792, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 7 ways as a sum of consecutive naturals, for example, 53979 + ... + 55190.

It is an arithmetic number, because the mean of its divisors is an integer number (8351505).

Almost surely, 2^66156414 is an apocalyptic number.

66156414 is an abundant number, since it is smaller than the sum of its proper divisors (67467666).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66156414 is a wasteful number, since it uses less digits than its factorization.

66156414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109275.

The product of its digits is 17280, while the sum is 33.

The square root of 66156414 is about 8133.6593240681. The cubic root of 66156414 is about 404.4429959147.

It can be divided in two parts, 661 and 56414, that added together give a palindrome (57075).

The spelling of 66156414 in words is "sixty-six million, one hundred fifty-six thousand, four hundred fourteen".