66698107 has 4 divisors (see below), whose sum is σ = 76226416. Its totient is φ = 57169800.

The previous prime is 66698083. The next prime is 66698119. The reversal of 66698107 is 70189666.

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

It is a cyclic number.

It is not a de Polignac number, because 66698107 - 2¹⁹ = 66173819 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66698167) 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, 4764144 + ... + 4764157.

It is an arithmetic number, because the mean of its divisors is an integer number (19056604).

Almost surely, 2^66698107 is an apocalyptic number.

66698107 is a deficient number, since it is larger than the sum of its proper divisors (9528309).

66698107 is an equidigital number, since it uses as much as digits as its factorization.

66698107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9528308.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 66698107 is about 8166.8909016835. The cubic root of 66698107 is about 405.5438651732.

The spelling of 66698107 in words is "sixty-six million, six hundred ninety-eight thousand, one hundred seven".