61015117729 has 2 divisors, whose sum is σ = 61015117730. Its totient is φ = 61015117728.

The previous prime is 61015117721. The next prime is 61015117739. The reversal of 61015117729 is 92771151016.

61015117729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59074274704 + 1940843025 = 243052^2 + 44055^2 .

It is a cyclic number.

It is not a de Polignac number, because 61015117729 - 2³ = 61015117721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61015117691 and 61015117700.

It is not a weakly prime, because it can be changed into another prime (61015117721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30507558864 + 30507558865.

It is an arithmetic number, because the mean of its divisors is an integer number (30507558865).

Almost surely, 2^61015117729 is an apocalyptic number.

It is an amenable number.

61015117729 is a deficient number, since it is larger than the sum of its proper divisors (1).

61015117729 is an equidigital number, since it uses as much as digits as its factorization.

61015117729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26460, while the sum is 40.

The spelling of 61015117729 in words is "sixty-one billion, fifteen million, one hundred seventeen thousand, seven hundred twenty-nine".