61660613652 has 96 divisors (see below), whose sum is σ = 159722110464. Its totient is φ = 18356284800.

The previous prime is 61660613629. The next prime is 61660613699. The reversal of 61660613652 is 25631606616.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7298943 + ... + 7307385.

It is an arithmetic number, because the mean of its divisors is an integer number (1663771984).

Almost surely, 2^61660613652 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 61660613652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79861055232).

61660613652 is an abundant number, since it is smaller than the sum of its proper divisors (98061496812).

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

61660613652 is a wasteful number, since it uses less digits than its factorization.

61660613652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9429 (or 9427 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 42.

The spelling of 61660613652 in words is "sixty-one billion, six hundred sixty million, six hundred thirteen thousand, six hundred fifty-two".