11998123458 has 32 divisors (see below), whose sum is σ = 25278013440. Its totient is φ = 3786060240.

The previous prime is 11998123457. The next prime is 11998123469. The reversal of 11998123458 is 85432189911.

It is a self number, because there is not a number n which added to its sum of digits gives 11998123458.

It is not an unprimeable number, because it can be changed into a prime (11998123457) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117343 + ... + 194333.

It is an arithmetic number, because the mean of its divisors is an integer number (789937920).

Almost surely, 2^11998123458 is an apocalyptic number.

11998123458 is an abundant number, since it is smaller than the sum of its proper divisors (13279889982).

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

11998123458 is a wasteful number, since it uses less digits than its factorization.

11998123458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78382.

The product of its digits is 622080, while the sum is 51.

The spelling of 11998123458 in words is "eleven billion, nine hundred ninety-eight million, one hundred twenty-three thousand, four hundred fifty-eight".