66918137 has 16 divisors (see below), whose sum is σ = 83244672. Its totient is φ = 52849920.

The previous prime is 66918113. The next prime is 66918149. The reversal of 66918137 is 73181966.

It is a cyclic number.

It is not a de Polignac number, because 66918137 - 2⁶ = 66918073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66918094 and 66918103.

It is not an unprimeable number, because it can be changed into a prime (66918107) 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, 11333 + ... + 16194.

It is an arithmetic number, because the mean of its divisors is an integer number (5202792).

Almost surely, 2^66918137 is an apocalyptic number.

It is an amenable number.

66918137 is a deficient number, since it is larger than the sum of its proper divisors (16326535).

66918137 is a wasteful number, since it uses less digits than its factorization.

66918137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27568.

The product of its digits is 54432, while the sum is 41.

The square root of 66918137 is about 8180.3506648554. The cubic root of 66918137 is about 405.9893244623.

The spelling of 66918137 in words is "sixty-six million, nine hundred eighteen thousand, one hundred thirty-seven".