61786868929 has 2 divisors, whose sum is σ = 61786868930. Its totient is φ = 61786868928.

The previous prime is 61786868879. The next prime is 61786868999. The reversal of 61786868929 is 92986868716.

It is an a-pointer prime, because the next prime (61786868999) can be obtained adding 61786868929 to its sum of digits (70).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58963009329 + 2823859600 = 242823^2 + 53140^2 .

It is a cyclic number.

It is not a de Polignac number, because 61786868929 - 2¹⁵ = 61786836161 is a prime.

It is not a weakly prime, because it can be changed into another prime (61786868999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30893434464 + 30893434465.

It is an arithmetic number, because the mean of its divisors is an integer number (30893434465).

Almost surely, 2^61786868929 is an apocalyptic number.

It is an amenable number.

61786868929 is a deficient number, since it is larger than the sum of its proper divisors (1).

61786868929 is an equidigital number, since it uses as much as digits as its factorization.

61786868929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 125411328, while the sum is 70.

The spelling of 61786868929 in words is "sixty-one billion, seven hundred eighty-six million, eight hundred sixty-eight thousand, nine hundred twenty-nine".