11551321552 has 20 divisors (see below), whose sum is σ = 22530896100. Its totient is φ = 5736896768.

The previous prime is 11551321511. The next prime is 11551321603. The reversal of 11551321552 is 25512315511.

It can be written as a sum of positive squares in 2 ways, for example, as 4810254736 + 6741066816 = 69356^2 + 82104^2 .

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, 2420293 + ... + 2425060.

It is an arithmetic number, because the mean of its divisors is an integer number (1126544805).

Almost surely, 2^11551321552 is an apocalyptic number.

It is an amenable number.

11551321552 is a deficient number, since it is larger than the sum of its proper divisors (10979574548).

11551321552 is a wasteful number, since it uses less digits than its factorization.

11551321552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4845510 (or 4845504 counting only the distinct ones).

The product of its digits is 7500, while the sum is 31.

The spelling of 11551321552 in words is "eleven billion, five hundred fifty-one million, three hundred twenty-one thousand, five hundred fifty-two".