78898664123 has 4 divisors (see below), whose sum is σ = 82329040848. Its totient is φ = 75468287400.

The previous prime is 78898664083. The next prime is 78898664129. The reversal of 78898664123 is 32146689887.

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 78898664123 - 2⁸ = 78898663867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78898664129) 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, 1715188328 + ... + 1715188373.

It is an arithmetic number, because the mean of its divisors is an integer number (20582260212).

Almost surely, 2^78898664123 is an apocalyptic number.

78898664123 is a deficient number, since it is larger than the sum of its proper divisors (3430376725).

78898664123 is a wasteful number, since it uses less digits than its factorization.

78898664123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3430376724.

The product of its digits is 27869184, while the sum is 62.

The spelling of 78898664123 in words is "seventy-eight billion, eight hundred ninety-eight million, six hundred sixty-four thousand, one hundred twenty-three".