11660651550 has 144 divisors (see below), whose sum is σ = 33745840128. Its totient is φ = 2878286400.

The previous prime is 11660651537. The next prime is 11660651567. The reversal of 11660651550 is 5515606611.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 302679 + ... + 339021.

It is an arithmetic number, because the mean of its divisors is an integer number (234346112).

Almost surely, 2^11660651550 is an apocalyptic number.

11660651550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 11660651550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16872920064).

11660651550 is an abundant number, since it is smaller than the sum of its proper divisors (22085188578).

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

11660651550 is a wasteful number, since it uses less digits than its factorization.

11660651550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36415 (or 36407 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 11660651550 in words is "eleven billion, six hundred sixty million, six hundred fifty-one thousand, five hundred fifty".