66655137 has 16 divisors (see below), whose sum is σ = 92148480. Its totient is φ = 42857360.

The previous prime is 66655133. The next prime is 66655157. The reversal of 66655137 is 73155666.

It is not a de Polignac number, because 66655137 - 2² = 66655133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66655095 and 66655104.

It is not an unprimeable number, because it can be changed into a prime (66655133) 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, 72712 + ... + 73622.

It is an arithmetic number, because the mean of its divisors is an integer number (5759280).

Almost surely, 2^66655137 is an apocalyptic number.

It is an amenable number.

66655137 is a deficient number, since it is larger than the sum of its proper divisors (25493343).

66655137 is an frugal number, since it uses more digits than its factorization.

66655137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001 (or 943 counting only the distinct ones).

The product of its digits is 113400, while the sum is 39.

The square root of 66655137 is about 8164.2597337419. The cubic root of 66655137 is about 405.4567564367.

The spelling of 66655137 in words is "sixty-six million, six hundred fifty-five thousand, one hundred thirty-seven".