5637735721 has 4 divisors (see below), whose sum is σ = 5969367252. Its totient is φ = 5306104192.

The previous prime is 5637735713. The next prime is 5637735751. The reversal of 5637735721 is 1275377365.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5115110400 + 522625321 = 71520^2 + 22861^2 .

It is not a de Polignac number, because 5637735721 - 2³ = 5637735713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5637735751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165815740 + ... + 165815773.

It is an arithmetic number, because the mean of its divisors is an integer number (1492341813).

Almost surely, 2^5637735721 is an apocalyptic number.

It is an amenable number.

5637735721 is a deficient number, since it is larger than the sum of its proper divisors (331631531).

5637735721 is a wasteful number, since it uses less digits than its factorization.

5637735721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331631530.

The product of its digits is 926100, while the sum is 46.

The square root of 5637735721 is about 75084.8568021542. The cubic root of 5637735721 is about 1779.7878509312.

The spelling of 5637735721 in words is "five billion, six hundred thirty-seven million, seven hundred thirty-five thousand, seven hundred twenty-one".