5661661161077 has 2 divisors, whose sum is σ = 5661661161078. Its totient is φ = 5661661161076.

The previous prime is 5661661161053. The next prime is 5661661161109. The reversal of 5661661161077 is 7701611661665.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5251458059236 + 410203101841 = 2291606^2 + 640471^2 .

It is a cyclic number.

It is not a de Polignac number, because 5661661161077 - 2²⁰ = 5661660112501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5661661161677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2830830580538 + 2830830580539.

It is an arithmetic number, because the mean of its divisors is an integer number (2830830580539).

Almost surely, 2^{5661661161077} is an apocalyptic number.

It is an amenable number.

5661661161077 is a deficient number, since it is larger than the sum of its proper divisors (1).

5661661161077 is an equidigital number, since it uses as much as digits as its factorization.

5661661161077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1905120, while the sum is 53.

The spelling of 5661661161077 in words is "five trillion, six hundred sixty-one billion, six hundred sixty-one million, one hundred sixty-one thousand, seventy-seven".