66571416 has 64 divisors (see below), whose sum is σ = 185702400. Its totient is φ = 22096800.

The previous prime is 66571387. The next prime is 66571433. The reversal of 66571416 is 61417566.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66681 + ... + 67671.

It is an arithmetic number, because the mean of its divisors is an integer number (2901600).

Almost surely, 2^66571416 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66571416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92851200).

66571416 is an abundant number, since it is smaller than the sum of its proper divisors (119130984).

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

66571416 is a wasteful number, since it uses less digits than its factorization.

66571416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1317 (or 1307 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 66571416 is about 8159.1308360634. The cubic root of 66571416 is about 405.2869297303.

The spelling of 66571416 in words is "sixty-six million, five hundred seventy-one thousand, four hundred sixteen".