61561840288231 has 2 divisors, whose sum is σ = 61561840288232. Its totient is φ = 61561840288230.

The previous prime is 61561840288181. The next prime is 61561840288237. The reversal of 61561840288231 is 13288204816516.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61561840288231 - 2¹⁵ = 61561840255463 is a prime.

It is a super-2 number, since 2×61561840288231² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61561840288237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30780920144115 + 30780920144116.

It is an arithmetic number, because the mean of its divisors is an integer number (30780920144116).

Almost surely, 2^{61561840288231} is an apocalyptic number.

61561840288231 is a deficient number, since it is larger than the sum of its proper divisors (1).

61561840288231 is an equidigital number, since it uses as much as digits as its factorization.

61561840288231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4423680, while the sum is 55.

The spelling of 61561840288231 in words is "sixty-one trillion, five hundred sixty-one billion, eight hundred forty million, two hundred eighty-eight thousand, two hundred thirty-one".