61722708768 has 144 divisors (see below), whose sum is σ = 200847943296. Its totient is φ = 17613158400.

The previous prime is 61722708721. The next prime is 61722708779. The reversal of 61722708768 is 86780722716.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (144).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1640568 + ... + 1677768.

It is an arithmetic number, because the mean of its divisors is an integer number (1394777384).

Almost surely, 2^61722708768 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61722708768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100423971648).

61722708768 is an abundant number, since it is smaller than the sum of its proper divisors (139125234528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61722708768 is a wasteful number, since it uses less digits than its factorization.

61722708768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38047 (or 38036 counting only the distinct ones).

The product of its (nonzero) digits is 3161088, while the sum is 54.

The spelling of 61722708768 in words is "sixty-one billion, seven hundred twenty-two million, seven hundred eight thousand, seven hundred sixty-eight".