66109637 has 16 divisors (see below), whose sum is σ = 73688064. Its totient is φ = 58806000.

The previous prime is 66109621. The next prime is 66109643. The reversal of 66109637 is 73690166.

It is not a de Polignac number, because 66109637 - 2⁴ = 66109621 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 66109637.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66109237) 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, 199562 + ... + 199892.

It is an arithmetic number, because the mean of its divisors is an integer number (4605504).

Almost surely, 2^66109637 is an apocalyptic number.

66109637 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

It is an amenable number.

66109637 is a deficient number, since it is larger than the sum of its proper divisors (7578427).

66109637 is a wasteful number, since it uses less digits than its factorization.

66109637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680.

The product of its (nonzero) digits is 40824, while the sum is 38.

The square root of 66109637 is about 8130.7832955995. The cubic root of 66109637 is about 404.3476507091.

The spelling of 66109637 in words is "sixty-six million, one hundred nine thousand, six hundred thirty-seven".