11949611520 has 640 divisors, whose sum is σ = 48308908032. Its totient is φ = 2468167680.

The previous prime is 11949611507. The next prime is 11949611533. The reversal of 11949611520 is 2511694911.

It is an interprime number because it is at equal distance from previous prime (11949611507) and next prime (11949611533).

It is a tau number, because it is divible by the number of its divisors (640).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 71554477 + ... + 71554643.

Almost surely, 2^11949611520 is an apocalyptic number.

11949611520 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 11949611520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24154454016).

11949611520 is an abundant number, since it is smaller than the sum of its proper divisors (36359296512).

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

11949611520 is an equidigital number, since it uses as much as digits as its factorization.

11949611520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233 (or 195 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 39.

The spelling of 11949611520 in words is "eleven billion, nine hundred forty-nine million, six hundred eleven thousand, five hundred twenty".