61430764789 has 2 divisors, whose sum is σ = 61430764790. Its totient is φ = 61430764788.

The previous prime is 61430764739. The next prime is 61430764841. The reversal of 61430764789 is 98746703416.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49903092100 + 11527672689 = 223390^2 + 107367^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61430764789 is a prime.

It is a super-2 number, since 2×61430764789² (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 (61430764729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30715382394 + 30715382395.

It is an arithmetic number, because the mean of its divisors is an integer number (30715382395).

Almost surely, 2^61430764789 is an apocalyptic number.

It is an amenable number.

61430764789 is a deficient number, since it is larger than the sum of its proper divisors (1).

61430764789 is an equidigital number, since it uses as much as digits as its factorization.

61430764789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6096384, while the sum is 55.

The spelling of 61430764789 in words is "sixty-one billion, four hundred thirty million, seven hundred sixty-four thousand, seven hundred eighty-nine".