123456667779 has 32 divisors (see below), whose sum is σ = 184930344000. Its totient is φ = 81393500160.

The previous prime is 123456667751. The next prime is 123456667843. The reversal of 123456667779 is 977766654321.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-123456667779 is a prime.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (123456667729) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1324839 + ... + 1414959.

It is an arithmetic number, because the mean of its divisors is an integer number (5779073250).

Almost surely, 2^123456667779 is an apocalyptic number.

123456667779 is a deficient number, since it is larger than the sum of its proper divisors (61473676221).

123456667779 is a wasteful number, since it uses less digits than its factorization.

123456667779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90692 (or 90686 counting only the distinct ones).

The product of its digits is 80015040, while the sum is 63.

The spelling of 123456667779 in words is "one hundred twenty-three billion, four hundred fifty-six million, six hundred sixty-seven thousand, seven hundred seventy-nine".