5520661621 has 8 divisors (see below), whose sum is σ = 5537600640. Its totient is φ = 5503743312.

The previous prime is 5520661607. The next prime is 5520661639. The reversal of 5520661621 is 1261660255.

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

It is a cyclic number.

It is not a de Polignac number, because 5520661621 - 2¹⁵ = 5520628853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5520661661) 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, 651216 + ... + 659638.

It is an arithmetic number, because the mean of its divisors is an integer number (692200080).

Almost surely, 2^5520661621 is an apocalyptic number.

It is an amenable number.

5520661621 is a deficient number, since it is larger than the sum of its proper divisors (16939019).

5520661621 is a wasteful number, since it uses less digits than its factorization.

5520661621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10355.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 5520661621 is about 74301.1549102704. The cubic root of 5520661621 is about 1767.3817909710.

The spelling of 5520661621 in words is "five billion, five hundred twenty million, six hundred sixty-one thousand, six hundred twenty-one".