61729399143 has 48 divisors (see below), whose sum is σ = 93367130272. Its totient is φ = 39261024000.

The previous prime is 61729399129. The next prime is 61729399181. The reversal of 61729399143 is 34199392716.

It is a happy number.

61729399143 is a `hidden beast` number, since 617 + 2 + 9 + 3 + 9 + 9 + 14 + 3 = 666.

It is not a de Polignac number, because 61729399143 - 2¹⁰ = 61729398119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61729399143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61729399243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6719013 + ... + 6728193.

Almost surely, 2^61729399143 is an apocalyptic number.

61729399143 is a deficient number, since it is larger than the sum of its proper divisors (31637731129).

61729399143 is a wasteful number, since it uses less digits than its factorization.

61729399143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9616 (or 9613 counting only the distinct ones).

The product of its digits is 2204496, while the sum is 54.

The spelling of 61729399143 in words is "sixty-one billion, seven hundred twenty-nine million, three hundred ninety-nine thousand, one hundred forty-three".