61729199999 has 8 divisors (see below), whose sum is σ = 62243948928. Its totient is φ = 61215845400.

The previous prime is 61729199941. The next prime is 61729200019. The reversal of 61729199999 is 99999192716.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61729199999 - 2⁸ = 61729199743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61729199599) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259577 + ... + 436850.

It is an arithmetic number, because the mean of its divisors is an integer number (7780493616).

Almost surely, 2^61729199999 is an apocalyptic number.

61729199999 is a deficient number, since it is larger than the sum of its proper divisors (514748929).

61729199999 is a wasteful number, since it uses less digits than its factorization.

61729199999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697165.

The product of its digits is 44641044, while the sum is 71.

The spelling of 61729199999 in words is "sixty-one billion, seven hundred twenty-nine million, one hundred ninety-nine thousand, nine hundred ninety-nine".