5501661 has 16 divisors (see below), whose sum is σ = 8043840. Its totient is φ = 3317120.

The previous prime is 5501653. The next prime is 5501681. The reversal of 5501661 is 1661055.

It is a cyclic number.

It is not a de Polignac number, because 5501661 - 2³ = 5501653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5501681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9385 + ... + 9953.

It is an arithmetic number, because the mean of its divisors is an integer number (502740).

Almost surely, 2^5501661 is an apocalyptic number.

It is an amenable number.

5501661 is a deficient number, since it is larger than the sum of its proper divisors (2542179).

5501661 is a wasteful number, since it uses less digits than its factorization.

5501661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 5501661 is about 2345.5619795691. The cubic root of 5501661 is about 176.5351843978.

Subtracting from 5501661 its reverse (1661055), we obtain a triangular number (3840606 = T₂₇₇₁).

It can be divided in two parts, 550 and 1661, that added together give a triangular number (2211 = T₆₆).

The spelling of 5501661 in words is "five million, five hundred one thousand, six hundred sixty-one".