5661315729 has 24 divisors (see below), whose sum is σ = 8214453000. Its totient is φ = 3757178880.

The previous prime is 5661315713. The next prime is 5661315739. The reversal of 5661315729 is 9275131665.

5661315729 is a `hidden beast` number, since 5 + 6 + 613 + 1 + 5 + 7 + 29 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 9734400 + 5651581329 = 3120^2 + 75177^2 .

It is not a de Polignac number, because 5661315729 - 2⁴ = 5661315713 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5661315739) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2104017 + ... + 2106705.

It is an arithmetic number, because the mean of its divisors is an integer number (342268875).

Almost surely, 2^5661315729 is an apocalyptic number.

It is an amenable number.

5661315729 is a deficient number, since it is larger than the sum of its proper divisors (2553137271).

5661315729 is a wasteful number, since it uses less digits than its factorization.

5661315729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3665 (or 3662 counting only the distinct ones).

The product of its digits is 340200, while the sum is 45.

The square root of 5661315729 is about 75241.7153512598. The cubic root of 5661315729 is about 1782.2657391831.

The spelling of 5661315729 in words is "five billion, six hundred sixty-one million, three hundred fifteen thousand, seven hundred twenty-nine".