66251416 has 64 divisors (see below), whose sum is σ = 156245760. Its totient is φ = 25584000.

The previous prime is 66251413. The next prime is 66251441. The reversal of 66251416 is 61415266.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66251411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80286 + ... + 81106.

It is an arithmetic number, because the mean of its divisors is an integer number (2441340).

Almost surely, 2^66251416 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 66251416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78122880).

66251416 is an abundant number, since it is smaller than the sum of its proper divisors (89994344).

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

66251416 is a wasteful number, since it uses less digits than its factorization.

66251416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976 (or 972 counting only the distinct ones).

The product of its digits is 8640, while the sum is 31.

The square root of 66251416 is about 8139.4972817736. The cubic root of 66251416 is about 404.6364995314.

The spelling of 66251416 in words is "sixty-six million, two hundred fifty-one thousand, four hundred sixteen".