5631661365 has 64 divisors (see below), whose sum is σ = 9937900800. Its totient is φ = 2700656640.

The previous prime is 5631661339. The next prime is 5631661369.

5631661365 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 5631661365 - 2¹⁰ = 5631660341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5631661369) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9759957 + ... + 9760533.

It is an arithmetic number, because the mean of its divisors is an integer number (155279700).

Almost surely, 2^5631661365 is an apocalyptic number.

5631661365 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

5631661365 is a deficient number, since it is larger than the sum of its proper divisors (4306239435).

5631661365 is a wasteful number, since it uses less digits than its factorization.

5631661365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1142.

The product of its digits is 291600, while the sum is 42.

The square root of 5631661365 is about 75044.3959599916. The cubic root of 5631661365 is about 1779.1484127683.

The spelling of 5631661365 in words is "five billion, six hundred thirty-one million, six hundred sixty-one thousand, three hundred sixty-five".