61730032160721 has 8 divisors (see below), whose sum is σ = 82464083755360. Its totient is φ = 41074667669952.

The previous prime is 61730032160711. The next prime is 61730032160759. The reversal of 61730032160721 is 12706123003716.

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

It is not a de Polignac number, because 61730032160721 - 2²² = 61730027966417 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 61730032160721.

It is not an unprimeable number, because it can be changed into a prime (61730032160711) 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, 19671774136 + ... + 19671777273.

It is an arithmetic number, because the mean of its divisors is an integer number (10308010469420).

Almost surely, 2^{61730032160721} is an apocalyptic number.

It is an amenable number.

61730032160721 is a deficient number, since it is larger than the sum of its proper divisors (20734051594639).

61730032160721 is a wasteful number, since it uses less digits than its factorization.

61730032160721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39343551935.

The product of its (nonzero) digits is 63504, while the sum is 39.

The spelling of 61730032160721 in words is "sixty-one trillion, seven hundred thirty billion, thirty-two million, one hundred sixty thousand, seven hundred twenty-one".