3551561644 has 12 divisors (see below), whose sum is σ = 6216873768. Its totient is φ = 1775312000.

The previous prime is 3551561623. The next prime is 3551561659. The reversal of 3551561644 is 4461651553.

It is a happy number.

3551561644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×3551561644³ (a number of 30 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 3551561597 and 3551561606.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99877 + ... + 130684.

It is an arithmetic number, because the mean of its divisors is an integer number (518072814).

Almost surely, 2^3551561644 is an apocalyptic number.

It is an amenable number.

3551561644 is a deficient number, since it is larger than the sum of its proper divisors (2665312124).

3551561644 is a wasteful number, since it uses less digits than its factorization.

3551561644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234416 (or 234414 counting only the distinct ones).

The product of its digits is 216000, while the sum is 40.

The square root of 3551561644 is about 59594.9800234886. The cubic root of 3551561644 is about 1525.7139566930.

The spelling of 3551561644 in words is "three billion, five hundred fifty-one million, five hundred sixty-one thousand, six hundred forty-four".