5661551553 has 16 divisors (see below), whose sum is σ = 8636991360. Its totient is φ = 3231472896.

The previous prime is 5661551549. The next prime is 5661551611. The reversal of 5661551553 is 3551551665.

It is a happy number.

It is not a de Polignac number, because 5661551553 - 2² = 5661551549 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5661551053) 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, 135288 + ... + 172121.

It is an arithmetic number, because the mean of its divisors is an integer number (539811960).

Almost surely, 2^5661551553 is an apocalyptic number.

It is an amenable number.

5661551553 is a deficient number, since it is larger than the sum of its proper divisors (2975439807).

5661551553 is a wasteful number, since it uses less digits than its factorization.

5661551553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308296.

The product of its digits is 337500, while the sum is 42.

The square root of 5661551553 is about 75243.2824443485. The cubic root of 5661551553 is about 1782.2904857980.

The spelling of 5661551553 in words is "five billion, six hundred sixty-one million, five hundred fifty-one thousand, five hundred fifty-three".