61101005521 has 2 divisors, whose sum is σ = 61101005522. Its totient is φ = 61101005520.

The previous prime is 61101005489. The next prime is 61101005593. The reversal of 61101005521 is 12550010116.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55178010000 + 5922995521 = 234900^2 + 76961^2 .

It is a cyclic number.

It is not a de Polignac number, because 61101005521 - 2⁵ = 61101005489 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61101005492 and 61101005501.

It is not a weakly prime, because it can be changed into another prime (61101003521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30550502760 + 30550502761.

It is an arithmetic number, because the mean of its divisors is an integer number (30550502761).

Almost surely, 2^61101005521 is an apocalyptic number.

It is an amenable number.

61101005521 is a deficient number, since it is larger than the sum of its proper divisors (1).

61101005521 is an equidigital number, since it uses as much as digits as its factorization.

61101005521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 300, while the sum is 22.

Adding to 61101005521 its reverse (12550010116), we get a palindrome (73651015637).

The spelling of 61101005521 in words is "sixty-one billion, one hundred one million, five thousand, five hundred twenty-one".