5421045661 has 8 divisors (see below), whose sum is σ = 5699914200. Its totient is φ = 5148306240.

The previous prime is 5421045613. The next prime is 5421045689. The reversal of 5421045661 is 1665401245.

It can be written as a sum of positive squares in 4 ways, for example, as 227104900 + 5193940761 = 15070^2 + 72069^2 .

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 5421045661 - 2¹⁵ = 5421012893 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 (5421045761) 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, 1530466 + ... + 1534003.

It is an arithmetic number, because the mean of its divisors is an integer number (712489275).

Almost surely, 2^5421045661 is an apocalyptic number.

It is an amenable number.

5421045661 is a deficient number, since it is larger than the sum of its proper divisors (278868539).

5421045661 is a wasteful number, since it uses less digits than its factorization.

5421045661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3064559.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 5421045661 is about 73627.7506175491. The cubic root of 5421045661 is about 1756.6868693700.

The spelling of 5421045661 in words is "five billion, four hundred twenty-one million, forty-five thousand, six hundred sixty-one".