61685699712 has 768 divisors, whose sum is σ = 218331832320. Its totient is φ = 15015813120.

The previous prime is 61685699693. The next prime is 61685699729. The reversal of 61685699712 is 21799658616.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 868812637 + ... + 868812707.

It is an arithmetic number, because the mean of its divisors is an integer number (284286240).

Almost surely, 2^61685699712 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 61685699712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109165916160).

61685699712 is an abundant number, since it is smaller than the sum of its proper divisors (156646132608).

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

61685699712 is a wasteful number, since it uses less digits than its factorization.

61685699712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201 (or 166 counting only the distinct ones).

The product of its digits is 9797760, while the sum is 60.

The spelling of 61685699712 in words is "sixty-one billion, six hundred eighty-five million, six hundred ninety-nine thousand, seven hundred twelve".