1861413655552 has 352 divisors, whose sum is σ = 4321327177728. Its totient is φ = 793497600000.

The previous prime is 1861413655531. The next prime is 1861413655571. The reversal of 1861413655552 is 2555563141681.

It is a tau number, because it is divible by the number of its divisors (352).

It is a self number, because there is not a number n which added to its sum of digits gives 1861413655552.

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, 2267251302 + ... + 2267252122.

It is an arithmetic number, because the mean of its divisors is an integer number (12276497664).

Almost surely, 2^{1861413655552} 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 1861413655552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2160663588864).

1861413655552 is an abundant number, since it is smaller than the sum of its proper divisors (2459913522176).

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

1861413655552 is a wasteful number, since it uses less digits than its factorization.

1861413655552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077 (or 1059 counting only the distinct ones).

The product of its digits is 4320000, while the sum is 52.

The spelling of 1861413655552 in words is "one trillion, eight hundred sixty-one billion, four hundred thirteen million, six hundred fifty-five thousand, five hundred fifty-two".