61143238660 has 96 divisors (see below), whose sum is σ = 152772399360. Its totient is φ = 20111390208.

The previous prime is 61143238621. The next prime is 61143238679. The reversal of 61143238660 is 6683234116.

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, 589459 + ... + 685381.

It is an arithmetic number, because the mean of its divisors is an integer number (1591379160).

Almost surely, 2^61143238660 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 61143238660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76386199680).

61143238660 is an abundant number, since it is smaller than the sum of its proper divisors (91629160700).

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

61143238660 is a wasteful number, since it uses less digits than its factorization.

61143238660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96125 (or 96123 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 40.

The spelling of 61143238660 in words is "sixty-one billion, one hundred forty-three million, two hundred thirty-eight thousand, six hundred sixty".