66537113 has 4 divisors (see below), whose sum is σ = 66613860. Its totient is φ = 66460368.

The previous prime is 66537109. The next prime is 66537131. The reversal of 66537113 is 31173566.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50239744 + 16297369 = 7088^2 + 4037^2 .

It is a cyclic number.

It is not a de Polignac number, because 66537113 - 2² = 66537109 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66537113.

It is not an unprimeable number, because it can be changed into a prime (66537103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37058 + ... + 38811.

It is an arithmetic number, because the mean of its divisors is an integer number (16653465).

Almost surely, 2^66537113 is an apocalyptic number.

It is an amenable number.

66537113 is a deficient number, since it is larger than the sum of its proper divisors (76747).

66537113 is an equidigital number, since it uses as much as digits as its factorization.

66537113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76746.

The product of its digits is 11340, while the sum is 32.

The square root of 66537113 is about 8157.0284417795. The cubic root of 66537113 is about 405.2173055233.

The spelling of 66537113 in words is "sixty-six million, five hundred thirty-seven thousand, one hundred thirteen".