123278862099 has 4 divisors (see below), whose sum is σ = 164371816136. Its totient is φ = 82185908064.

The previous prime is 123278862061. The next prime is 123278862127. The reversal of 123278862099 is 990268872321.

It is a happy number.

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

It is not a de Polignac number, because 123278862099 - 2¹⁷ = 123278731027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123278862019) 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, 20546477014 + ... + 20546477019.

It is an arithmetic number, because the mean of its divisors is an integer number (41092954034).

Almost surely, 2^123278862099 is an apocalyptic number.

123278862099 is a deficient number, since it is larger than the sum of its proper divisors (41092954037).

123278862099 is an equidigital number, since it uses as much as digits as its factorization.

123278862099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41092954036.

The product of its (nonzero) digits is 5225472, while the sum is 57.

The spelling of 123278862099 in words is "one hundred twenty-three billion, two hundred seventy-eight million, eight hundred sixty-two thousand, ninety-nine".