61729026719 has 16 divisors (see below), whose sum is σ = 63045204480. Its totient is φ = 60425386560.

The previous prime is 61729026707. The next prime is 61729026739. The reversal of 61729026719 is 91762092716.

It is a cyclic number.

It is not a de Polignac number, because 61729026719 - 2⁴ = 61729026703 is a prime.

It is a super-2 number, since 2×61729026719² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61729026739) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10161467 + ... + 10167539.

It is an arithmetic number, because the mean of its divisors is an integer number (3940325280).

Almost surely, 2^61729026719 is an apocalyptic number.

61729026719 is a deficient number, since it is larger than the sum of its proper divisors (1316177761).

61729026719 is a wasteful number, since it uses less digits than its factorization.

61729026719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7070.

The product of its (nonzero) digits is 571536, while the sum is 50.

The spelling of 61729026719 in words is "sixty-one billion, seven hundred twenty-nine million, twenty-six thousand, seven hundred nineteen".