61389669768 has 256 divisors, whose sum is σ = 189490544640. Its totient is φ = 16201036800.

The previous prime is 61389669767. The next prime is 61389669773. The reversal of 61389669768 is 86796698316.

It is not an unprimeable number, because it can be changed into a prime (61389669767) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10209883 + ... + 10215893.

It is an arithmetic number, because the mean of its divisors is an integer number (740197440).

Almost surely, 2^61389669768 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 61389669768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94745272320).

61389669768 is an abundant number, since it is smaller than the sum of its proper divisors (128100874872).

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

61389669768 is a wasteful number, since it uses less digits than its factorization.

61389669768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6148 (or 6144 counting only the distinct ones).

The product of its digits is 141087744, while the sum is 69.

The spelling of 61389669768 in words is "sixty-one billion, three hundred eighty-nine million, six hundred sixty-nine thousand, seven hundred sixty-eight".