11990618640 has 960 divisors, whose sum is σ = 54908485632. Its totient is φ = 2264371200.

The previous prime is 11990618623. The next prime is 11990618641. The reversal of 11990618640 is 4681609911.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (11990618641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 91531375 + ... + 91531505.

Almost surely, 2^11990618640 is an apocalyptic number.

11990618640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11990618640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27454242816).

11990618640 is an abundant number, since it is smaller than the sum of its proper divisors (42917866992).

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

11990618640 is a wasteful number, since it uses less digits than its factorization.

11990618640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308 (or 299 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The spelling of 11990618640 in words is "eleven billion, nine hundred ninety million, six hundred eighteen thousand, six hundred forty".