3504551661 has 48 divisors (see below), whose sum is σ = 5717166000. Its totient is φ = 2053610496.

The previous prime is 3504551641. The next prime is 3504551689. The reversal of 3504551661 is 1661554053.

It can be written as a sum of positive squares in 8 ways, for example, as 47817225 + 3456734436 = 6915^2 + 58794^2 .

It is not a de Polignac number, because 3504551661 - 2¹⁵ = 3504518893 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3504551621) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 240615 + ... + 254763.

It is an arithmetic number, because the mean of its divisors is an integer number (119107625).

Almost surely, 2^3504551661 is an apocalyptic number.

It is an amenable number.

3504551661 is a deficient number, since it is larger than the sum of its proper divisors (2212614339).

3504551661 is a wasteful number, since it uses less digits than its factorization.

3504551661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14270 (or 14267 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The square root of 3504551661 is about 59199.2538888794. The cubic root of 3504551661 is about 1518.9523686239.

The spelling of 3504551661 in words is "three billion, five hundred four million, five hundred fifty-one thousand, six hundred sixty-one".