11515516512 has 48 divisors (see below), whose sum is σ = 31045219632. Its totient is φ = 3734760960.

The previous prime is 11515516489. The next prime is 11515516517. The reversal of 11515516512 is 21561551511.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×11515516512² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11515516517) 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, 1617439 + ... + 1624542.

It is an arithmetic number, because the mean of its divisors is an integer number (646775409).

Almost surely, 2^11515516512 is an apocalyptic number.

11515516512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

11515516512 is an abundant number, since it is smaller than the sum of its proper divisors (19529703120).

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

11515516512 is a wasteful number, since it uses less digits than its factorization.

11515516512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3242031 (or 3242023 counting only the distinct ones).

The product of its digits is 7500, while the sum is 33.

The spelling of 11515516512 in words is "eleven billion, five hundred fifteen million, five hundred sixteen thousand, five hundred twelve".