61430157749 has 2 divisors, whose sum is σ = 61430157750. Its totient is φ = 61430157748.

The previous prime is 61430157673. The next prime is 61430157769. The reversal of 61430157749 is 94775103416.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46734657124 + 14695500625 = 216182^2 + 121225^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61430157749 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61430157769) 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, 30715078874 + 30715078875.

It is an arithmetic number, because the mean of its divisors is an integer number (30715078875).

Almost surely, 2^61430157749 is an apocalyptic number.

It is an amenable number.

61430157749 is a deficient number, since it is larger than the sum of its proper divisors (1).

61430157749 is an equidigital number, since it uses as much as digits as its factorization.

61430157749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 635040, while the sum is 47.

The spelling of 61430157749 in words is "sixty-one billion, four hundred thirty million, one hundred fifty-seven thousand, seven hundred forty-nine".