5645540661 has 8 divisors (see below), whose sum is σ = 7923565920. Its totient is φ = 3565604592.

The previous prime is 5645540657. The next prime is 5645540683. The reversal of 5645540661 is 1660455465.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 5645540661 - 2² = 5645540657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5645540161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49522230 + ... + 49522343.

It is an arithmetic number, because the mean of its divisors is an integer number (990445740).

Almost surely, 2^5645540661 is an apocalyptic number.

It is an amenable number.

5645540661 is a deficient number, since it is larger than the sum of its proper divisors (2278025259).

5645540661 is a wasteful number, since it uses less digits than its factorization.

5645540661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99044595.

The product of its (nonzero) digits is 432000, while the sum is 42.

The square root of 5645540661 is about 75136.8129547694. The cubic root of 5645540661 is about 1780.6087911488.

The spelling of 5645540661 in words is "five billion, six hundred forty-five million, five hundred forty thousand, six hundred sixty-one".