61405005517 has 2 divisors, whose sum is σ = 61405005518. Its totient is φ = 61405005516.

The previous prime is 61405005463. The next prime is 61405005539. The reversal of 61405005517 is 71550050416.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59227009956 + 2177995561 = 243366^2 + 46669^2 .

It is a cyclic number.

It is not a de Polignac number, because 61405005517 - 2¹¹ = 61405003469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61405009517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30702502758 + 30702502759.

It is an arithmetic number, because the mean of its divisors is an integer number (30702502759).

Almost surely, 2^61405005517 is an apocalyptic number.

It is an amenable number.

61405005517 is a deficient number, since it is larger than the sum of its proper divisors (1).

61405005517 is an equidigital number, since it uses as much as digits as its factorization.

61405005517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21000, while the sum is 34.

The spelling of 61405005517 in words is "sixty-one billion, four hundred five million, five thousand, five hundred seventeen".