5521211661 has 32 divisors (see below), whose sum is σ = 8881056000. Its totient is φ = 3046169280.

The previous prime is 5521211557. The next prime is 5521211677. The reversal of 5521211661 is 1661121255.

It is not a de Polignac number, because 5521211661 - 2¹³ = 5521203469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5521211461) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62670 + ... + 122351.

It is an arithmetic number, because the mean of its divisors is an integer number (277533000).

Almost surely, 2^5521211661 is an apocalyptic number.

It is an amenable number.

5521211661 is a deficient number, since it is larger than the sum of its proper divisors (3359844339).

5521211661 is a wasteful number, since it uses less digits than its factorization.

5521211661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185074 (or 185060 counting only the distinct ones).

The product of its digits is 3600, while the sum is 30.

The square root of 5521211661 is about 74304.8562410291. The cubic root of 5521211661 is about 1767.4404855300.

The spelling of 5521211661 in words is "five billion, five hundred twenty-one million, two hundred eleven thousand, six hundred sixty-one".