61389888829 has 2 divisors, whose sum is σ = 61389888830. Its totient is φ = 61389888828.

The previous prime is 61389888821. The next prime is 61389888841. The reversal of 61389888829 is 92888898316.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47980712025 + 13409176804 = 219045^2 + 115798^2 .

It is a cyclic number.

It is not a de Polignac number, because 61389888829 - 2³ = 61389888821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61389888821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30694944414 + 30694944415.

It is an arithmetic number, because the mean of its divisors is an integer number (30694944415).

Almost surely, 2^61389888829 is an apocalyptic number.

It is an amenable number.

61389888829 is a deficient number, since it is larger than the sum of its proper divisors (1).

61389888829 is an equidigital number, since it uses as much as digits as its factorization.

61389888829 is an evil number, because the sum of its binary digits is even.

The product of its digits is 95551488, while the sum is 70.

The spelling of 61389888829 in words is "sixty-one billion, three hundred eighty-nine million, eight hundred eighty-eight thousand, eight hundred twenty-nine".