5661511642667 has 2 divisors, whose sum is σ = 5661511642668. Its totient is φ = 5661511642666.

The previous prime is 5661511642481. The next prime is 5661511642679. The reversal of 5661511642667 is 7662461151665.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 5661511642667 - 2²⁸ = 5661243207211 is a prime.

It is not a weakly prime, because it can be changed into another prime (5661516642667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2830755821333 + 2830755821334.

It is an arithmetic number, because the mean of its divisors is an integer number (2830755821334).

Almost surely, 2^{5661511642667} is an apocalyptic number.

5661511642667 is a deficient number, since it is larger than the sum of its proper divisors (1).

5661511642667 is an equidigital number, since it uses as much as digits as its factorization.

5661511642667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10886400, while the sum is 56.

The spelling of 5661511642667 in words is "five trillion, six hundred sixty-one billion, five hundred eleven million, six hundred forty-two thousand, six hundred sixty-seven".