3661661551 has 8 divisors (see below), whose sum is σ = 3864721520. Its totient is φ = 3459635712.

The previous prime is 3661661527. The next prime is 3661661581. The reversal of 3661661551 is 1551661663.

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 3661661551 - 2⁵ = 3661661519 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 (3661661581) 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, 251250 + ... + 265423.

It is an arithmetic number, because the mean of its divisors is an integer number (483090190).

Almost surely, 2^3661661551 is an apocalyptic number.

3661661551 is a deficient number, since it is larger than the sum of its proper divisors (203059969).

3661661551 is a wasteful number, since it uses less digits than its factorization.

3661661551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517065.

The product of its digits is 97200, while the sum is 40.

The square root of 3661661551 is about 60511.6645862597. The cubic root of 3661661551 is about 1541.3197141591.

The spelling of 3661661551 in words is "three billion, six hundred sixty-one million, six hundred sixty-one thousand, five hundred fifty-one".