61729080321 has 8 divisors (see below), whose sum is σ = 82307824704. Its totient is φ = 41151528080.

The previous prime is 61729080299. The next prime is 61729080419. The reversal of 61729080321 is 12308092716.

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 61729080321 - 2¹¹ = 61729078273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61729080321.

It is not an unprimeable number, because it can be changed into a prime (61729080121) 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, 169266 + ... + 390011.

It is an arithmetic number, because the mean of its divisors is an integer number (10288478088).

Almost surely, 2^61729080321 is an apocalyptic number.

It is an amenable number.

61729080321 is a deficient number, since it is larger than the sum of its proper divisors (20578744383).

61729080321 is a wasteful number, since it uses less digits than its factorization.

61729080321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596071.

The product of its (nonzero) digits is 36288, while the sum is 39.

The spelling of 61729080321 in words is "sixty-one billion, seven hundred twenty-nine million, eighty thousand, three hundred twenty-one".