656155141551661 has 2 divisors, whose sum is σ = 656155141551662. Its totient is φ = 656155141551660.

The previous prime is 656155141551599. The next prime is 656155141551667. The reversal of 656155141551661 is 166155141551656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 435238940989161 + 220916200562500 = 20862381^2 + 14863250^2 .

It is a cyclic number.

It is not a de Polignac number, because 656155141551661 - 2³⁷ = 656017702598189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 656155141551596 and 656155141551605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656155141551667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328077570775830 + 328077570775831.

It is an arithmetic number, because the mean of its divisors is an integer number (328077570775831).

Almost surely, 2^{656155141551661} is an apocalyptic number.

It is an amenable number.

656155141551661 is a deficient number, since it is larger than the sum of its proper divisors (1).

656155141551661 is an equidigital number, since it uses as much as digits as its factorization.

656155141551661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16200000, while the sum is 58.

The spelling of 656155141551661 in words is "six hundred fifty-six trillion, one hundred fifty-five billion, one hundred forty-one million, five hundred fifty-one thousand, six hundred sixty-one".