11996557650 has 288 divisors, whose sum is σ = 41675332608. Its totient is φ = 2492596800.

The previous prime is 11996557621. The next prime is 11996557663. The reversal of 11996557650 is 5675569911.

11996557650 is a `hidden beast` number, since 1 + 1 + 9 + 9 + 65 + 576 + 5 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 929139 + ... + 941961.

It is an arithmetic number, because the mean of its divisors is an integer number (144706016).

Almost surely, 2^11996557650 is an apocalyptic number.

11996557650 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 11996557650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20837666304).

11996557650 is an abundant number, since it is smaller than the sum of its proper divisors (29678774958).

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

11996557650 is a wasteful number, since it uses less digits than its factorization.

11996557650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12868 (or 12851 counting only the distinct ones).

The product of its (nonzero) digits is 2551500, while the sum is 54.

The spelling of 11996557650 in words is "eleven billion, nine hundred ninety-six million, five hundred fifty-seven thousand, six hundred fifty".