5661576551 has 4 divisors (see below), whose sum is σ = 5663238792. Its totient is φ = 5659914312.

The previous prime is 5661576493. The next prime is 5661576559. The reversal of 5661576551 is 1556751665.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5661576551 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 5661576496 and 5661576505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5661576559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 826001 + ... + 832826.

It is an arithmetic number, because the mean of its divisors is an integer number (1415809698).

Almost surely, 2^5661576551 is an apocalyptic number.

5661576551 is a deficient number, since it is larger than the sum of its proper divisors (1662241).

5661576551 is a wasteful number, since it uses less digits than its factorization.

5661576551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1662240.

The product of its digits is 945000, while the sum is 47.

The square root of 5661576551 is about 75243.4485586619. The cubic root of 5661576551 is about 1782.2931089677.

The spelling of 5661576551 in words is "five billion, six hundred sixty-one million, five hundred seventy-six thousand, five hundred fifty-one".