61565561069 has 2 divisors, whose sum is σ = 61565561070. Its totient is φ = 61565561068.

The previous prime is 61565561041. The next prime is 61565561119. The reversal of 61565561069 is 96016556516.

It is a happy number.

It is an a-pointer prime, because the next prime (61565561119) can be obtained adding 61565561069 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35499458569 + 26066102500 = 188413^2 + 161450^2 .

It is a cyclic number.

It is not a de Polignac number, because 61565561069 - 2¹² = 61565556973 is a prime.

It is a super-2 number, since 2×61565561069² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61565561569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30782780534 + 30782780535.

It is an arithmetic number, because the mean of its divisors is an integer number (30782780535).

Almost surely, 2^61565561069 is an apocalyptic number.

It is an amenable number.

61565561069 is a deficient number, since it is larger than the sum of its proper divisors (1).

61565561069 is an equidigital number, since it uses as much as digits as its factorization.

61565561069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458000, while the sum is 50.

The spelling of 61565561069 in words is "sixty-one billion, five hundred sixty-five million, five hundred sixty-one thousand, sixty-nine".