11990701998 has 80 divisors (see below), whose sum is σ = 29475135360. Its totient is φ = 3613150800.

The previous prime is 11990701981. The next prime is 11990702011. The reversal of 11990701998 is 89910709911.

It is a happy number.

It is a super-3 number, since 3×11990701998³ (a number of 31 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 300183 + ... + 337773.

It is an arithmetic number, because the mean of its divisors is an integer number (368439192).

Almost surely, 2^11990701998 is an apocalyptic number.

11990701998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 11990701998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14737567680).

11990701998 is an abundant number, since it is smaller than the sum of its proper divisors (17484433362).

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

11990701998 is a wasteful number, since it uses less digits than its factorization.

11990701998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37795 (or 37786 counting only the distinct ones).

The product of its (nonzero) digits is 367416, while the sum is 54.

The spelling of 11990701998 in words is "eleven billion, nine hundred ninety million, seven hundred one thousand, nine hundred ninety-eight".