36553233721 has 3 divisors (see below), whose sum is σ = 36553424911. Its totient is φ = 36553042532.

The previous prime is 36553233709. The next prime is 36553233737. The reversal of 36553233721 is 12733235563.

The square root of 36553233721 is 191189.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 6824577321 + 29728656400 = 82611^2 + 172420^2 .

It is a de Polignac number, because none of the positive numbers 2^k-36553233721 is a prime.

It is a super-2 number, since 2×36553233721² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36553233121) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 95595 + ... + 286783.

Almost surely, 2^36553233721 is an apocalyptic number.

36553233721 is the 191189-th square number.

36553233721 is the 95595-th centered octagonal number.

It is an amenable number.

36553233721 is a deficient number, since it is larger than the sum of its proper divisors (191190).

36553233721 is an frugal number, since it uses more digits than its factorization.

36553233721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382378 (or 191189 counting only the distinct ones).

The product of its digits is 340200, while the sum is 40.

The spelling of 36553233721 in words is "thirty-six billion, five hundred fifty-three million, two hundred thirty-three thousand, seven hundred twenty-one".