61511522693 has 2 divisors, whose sum is σ = 61511522694. Its totient is φ = 61511522692.

The previous prime is 61511522641. The next prime is 61511522731. The reversal of 61511522693 is 39622511516.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52577114209 + 8934408484 = 229297^2 + 94522^2 .

It is a cyclic number.

It is not a de Polignac number, because 61511522693 - 2²⁰ = 61510474117 is a prime.

It is a super-2 number, since 2×61511522693² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61511522693.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61511522593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30755761346 + 30755761347.

It is an arithmetic number, because the mean of its divisors is an integer number (30755761347).

Almost surely, 2^61511522693 is an apocalyptic number.

It is an amenable number.

61511522693 is a deficient number, since it is larger than the sum of its proper divisors (1).

61511522693 is an equidigital number, since it uses as much as digits as its factorization.

61511522693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 97200, while the sum is 41.

The spelling of 61511522693 in words is "sixty-one billion, five hundred eleven million, five hundred twenty-two thousand, six hundred ninety-three".