1185861061840 has 960 divisors, whose sum is σ = 3675450470400. Its totient is φ = 355053404160.

The previous prime is 1185861061831. The next prime is 1185861061841. The reversal of 1185861061840 is 481601685811.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1185861061841) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 10494345624 + ... + 10494345736.

It is an arithmetic number, because the mean of its divisors is an integer number (3828594240).

Almost surely, 2^{1185861061840} is an apocalyptic number.

1185861061840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1185861061840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1837725235200).

1185861061840 is an abundant number, since it is smaller than the sum of its proper divisors (2489589408560).

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

1185861061840 is a wasteful number, since it uses less digits than its factorization.

1185861061840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277 (or 244 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 49.

The spelling of 1185861061840 in words is "one trillion, one hundred eighty-five billion, eight hundred sixty-one million, sixty-one thousand, eight hundred forty".