61305684169 has 2 divisors, whose sum is σ = 61305684170. Its totient is φ = 61305684168.

The previous prime is 61305684091. The next prime is 61305684179. The reversal of 61305684169 is 96148650316.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61262190144 + 43494025 = 247512^2 + 6595^2 .

It is a cyclic number.

It is not a de Polignac number, because 61305684169 - 2²¹ = 61303587017 is a prime.

It is a super-2 number, since 2×61305684169² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61305684179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30652842084 + 30652842085.

It is an arithmetic number, because the mean of its divisors is an integer number (30652842085).

Almost surely, 2^61305684169 is an apocalyptic number.

It is an amenable number.

61305684169 is a deficient number, since it is larger than the sum of its proper divisors (1).

61305684169 is an equidigital number, since it uses as much as digits as its factorization.

61305684169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 933120, while the sum is 49.

It can be divided in two parts, 613056 and 84169, that added together give a square (697225 = 835²).

The spelling of 61305684169 in words is "sixty-one billion, three hundred five million, six hundred eighty-four thousand, one hundred sixty-nine".