66858538115 has 8 divisors (see below), whose sum is σ = 80231633520. Its totient is φ = 53485905312.

The previous prime is 66858538067. The next prime is 66858538169. The reversal of 66858538115 is 51183585866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66858538115 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 511292 + ... + 628598.

It is an arithmetic number, because the mean of its divisors is an integer number (10028954190).

Almost surely, 2^66858538115 is an apocalyptic number.

66858538115 is a deficient number, since it is larger than the sum of its proper divisors (13373095405).

66858538115 is a wasteful number, since it uses less digits than its factorization.

66858538115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231301.

The product of its digits is 6912000, while the sum is 56.

The spelling of 66858538115 in words is "sixty-six billion, eight hundred fifty-eight million, five hundred thirty-eight thousand, one hundred fifteen".