66537939 has 16 divisors (see below), whose sum is σ = 95703552. Its totient is φ = 40877088.

The previous prime is 66537923. The next prime is 66537941. The reversal of 66537939 is 93973566.

It is a happy number.

It is not a de Polignac number, because 66537939 - 2⁴ = 66537923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66537959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31222 + ... + 33284.

It is an arithmetic number, because the mean of its divisors is an integer number (5981472).

Almost surely, 2^66537939 is an apocalyptic number.

66537939 is a deficient number, since it is larger than the sum of its proper divisors (29165613).

66537939 is a wasteful number, since it uses less digits than its factorization.

66537939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2906.

The product of its digits is 918540, while the sum is 48.

The square root of 66537939 is about 8157.0790728054. The cubic root of 66537939 is about 405.2189823224.

It can be divided in two parts, 66537 and 939, that added together give a palindrome (67476).

The spelling of 66537939 in words is "sixty-six million, five hundred thirty-seven thousand, nine hundred thirty-nine".