5661557507 has 2 divisors, whose sum is σ = 5661557508. Its totient is φ = 5661557506.

The previous prime is 5661557491. The next prime is 5661557513. The reversal of 5661557507 is 7057551665.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 5661557507 - 2⁴ = 5661557491 is a prime.

It is not a weakly prime, because it can be changed into another prime (5661557597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2830778753 + 2830778754.

It is an arithmetic number, because the mean of its divisors is an integer number (2830778754).

Almost surely, 2^5661557507 is an apocalyptic number.

5661557507 is a deficient number, since it is larger than the sum of its proper divisors (1).

5661557507 is an equidigital number, since it uses as much as digits as its factorization.

5661557507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1102500, while the sum is 47.

The square root of 5661557507 is about 75243.3220093318. The cubic root of 5661557507 is about 1782.2911105828.

The spelling of 5661557507 in words is "five billion, six hundred sixty-one million, five hundred fifty-seven thousand, five hundred seven".