66156416 has 16 divisors (see below), whose sum is σ = 131796240. Its totient is φ = 33078144.

The previous prime is 66156383. The next prime is 66156421. The reversal of 66156416 is 61465166.

It is a tau number, because it is divible by the number of its divisors (16).

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, 258296 + ... + 258551.

It is an arithmetic number, because the mean of its divisors is an integer number (8237265).

Almost surely, 2^66156416 is an apocalyptic number.

It is an amenable number.

66156416 is a deficient number, since it is larger than the sum of its proper divisors (65639824).

66156416 is an equidigital number, since it uses as much as digits as its factorization.

66156416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516861 (or 516849 counting only the distinct ones).

The product of its digits is 25920, while the sum is 35.

The square root of 66156416 is about 8133.6594470140. The cubic root of 66156416 is about 404.4429999904.

It can be divided in two parts, 6615 and 6416, that added together give a palindrome (13031).

The spelling of 66156416 in words is "sixty-six million, one hundred fifty-six thousand, four hundred sixteen".