123345302778 has 24 divisors (see below), whose sum is σ = 267427937088. Its totient is φ = 41087442312.

The previous prime is 123345302777. The next prime is 123345302797. The reversal of 123345302778 is 877203543321.

It is a happy number.

123345302778 is a `hidden beast` number, since 1 + 2 + 3 + 345 + 30 + 277 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (123345302777) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2277376 + ... + 2330907.

It is an arithmetic number, because the mean of its divisors is an integer number (11142830712).

Almost surely, 2^123345302778 is an apocalyptic number.

123345302778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

123345302778 is an abundant number, since it is smaller than the sum of its proper divisors (144082634310).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123345302778 is a wasteful number, since it uses less digits than its factorization.

123345302778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4609778 (or 4609775 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 45.

The spelling of 123345302778 in words is "one hundred twenty-three billion, three hundred forty-five million, three hundred two thousand, seven hundred seventy-eight".