99478178929 has 4 divisors (see below), whose sum is σ = 99572830960. Its totient is φ = 99383526900.

The previous prime is 99478178879. The next prime is 99478178939. The reversal of 99478178929 is 92987187499.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 99478178929 - 2⁹ = 99478178417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99478178939) 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, 47324439 + ... + 47326540.

It is an arithmetic number, because the mean of its divisors is an integer number (24893207740).

Almost surely, 2^99478178929 is an apocalyptic number.

It is an amenable number.

99478178929 is a deficient number, since it is larger than the sum of its proper divisors (94652031).

99478178929 is a wasteful number, since it uses less digits than its factorization.

99478178929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94652030.

The product of its digits is 164602368, while the sum is 73.

The spelling of 99478178929 in words is "ninety-nine billion, four hundred seventy-eight million, one hundred seventy-eight thousand, nine hundred twenty-nine".