11661735640 has 32 divisors (see below), whose sum is σ = 27619902000. Its totient is φ = 4419183744.

The previous prime is 11661735601. The next prime is 11661735641. The reversal of 11661735640 is 4653716611.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 11661735593 and 11661735602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11661735641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7671435 + ... + 7672954.

Almost surely, 2^11661735640 is an apocalyptic number.

11661735640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11661735640 is an abundant number, since it is smaller than the sum of its proper divisors (15958166360).

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

11661735640 is a wasteful number, since it uses less digits than its factorization.

11661735640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15344419 (or 15344415 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 40.

The spelling of 11661735640 in words is "eleven billion, six hundred sixty-one million, seven hundred thirty-five thousand, six hundred forty".