11215664540 has 24 divisors (see below), whose sum is σ = 23564399040. Its totient is φ = 4484074688.

The previous prime is 11215664539. The next prime is 11215664549. The reversal of 11215664540 is 4546651211.

It is a super-2 number, since 2×11215664540² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11215664540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11215664549) 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, 94655 + ... + 177174.

It is an arithmetic number, because the mean of its divisors is an integer number (981849960).

Almost surely, 2^11215664540 is an apocalyptic number.

11215664540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11215664540 is an abundant number, since it is smaller than the sum of its proper divisors (12348734500).

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

11215664540 is a wasteful number, since it uses less digits than its factorization.

11215664540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273901 (or 273899 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 35.

The spelling of 11215664540 in words is "eleven billion, two hundred fifteen million, six hundred sixty-four thousand, five hundred forty".