66313544 has 32 divisors (see below), whose sum is σ = 137181600. Its totient is φ = 29800320.

The previous prime is 66313543. The next prime is 66313567. The reversal of 66313544 is 44531366.

It is a super-2 number, since 2×66313544² = 8794972235679872, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66313544.

It is not an unprimeable number, because it can be changed into a prime (66313543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3599 + ... + 12065.

It is an arithmetic number, because the mean of its divisors is an integer number (4286925).

Almost surely, 2^66313544 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 66313544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68590800).

66313544 is an abundant number, since it is smaller than the sum of its proper divisors (70868056).

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

66313544 is a wasteful number, since it uses less digits than its factorization.

66313544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8573 (or 8569 counting only the distinct ones).

The product of its digits is 25920, while the sum is 32.

The square root of 66313544 is about 8143.3128393793. The cubic root of 66313544 is about 404.7629441362.

The spelling of 66313544 in words is "sixty-six million, three hundred thirteen thousand, five hundred forty-four".