66715552 has 48 divisors (see below), whose sum is σ = 135263520. Its totient is φ = 32378112.

The previous prime is 66715541. The next prime is 66715567. The reversal of 66715552 is 25551766.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 235603 + ... + 235885.

It is an arithmetic number, because the mean of its divisors is an integer number (2817990).

Almost surely, 2^66715552 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 66715552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67631760).

66715552 is an abundant number, since it is smaller than the sum of its proper divisors (68547968).

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

66715552 is a wasteful number, since it uses less digits than its factorization.

66715552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485 (or 477 counting only the distinct ones).

The product of its digits is 63000, while the sum is 37.

The square root of 66715552 is about 8167.9588637554. The cubic root of 66715552 is about 405.5792189802.

The spelling of 66715552 in words is "sixty-six million, seven hundred fifteen thousand, five hundred fifty-two".