61665606592 has 56 divisors (see below), whose sum is σ = 126019137344. Its totient is φ = 29917320192.

The previous prime is 61665606571. The next prime is 61665606593. The reversal of 61665606592 is 29560656616.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61665606593) 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, 833578 + ... + 904534.

Almost surely, 2^61665606592 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 61665606592, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63009568672).

61665606592 is an abundant number, since it is smaller than the sum of its proper divisors (64353530752).

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

61665606592 is a wasteful number, since it uses less digits than its factorization.

61665606592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71373 (or 71363 counting only the distinct ones).

The product of its (nonzero) digits is 3499200, while the sum is 52.

The spelling of 61665606592 in words is "sixty-one billion, six hundred sixty-five million, six hundred six thousand, five hundred ninety-two".