11636535640 has 16 divisors (see below), whose sum is σ = 26182205280. Its totient is φ = 4654614240.

The previous prime is 11636535611. The next prime is 11636535667. The reversal of 11636535640 is 4653563611.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 290913391 = 11636535640 / (1 + 1 + 6 + 3 + 6 + 5 + 3 + 5 + 6 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 11636535593 and 11636535602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145456656 + ... + 145456735.

It is an arithmetic number, because the mean of its divisors is an integer number (1636387830).

Almost surely, 2^11636535640 is an apocalyptic number.

11636535640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11636535640 is an abundant number, since it is smaller than the sum of its proper divisors (14545669640).

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

11636535640 is a wasteful number, since it uses less digits than its factorization.

11636535640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290913402 (or 290913398 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 40.

The spelling of 11636535640 in words is "eleven billion, six hundred thirty-six million, five hundred thirty-five thousand, six hundred forty".