1861617098880 has 2048 divisors, whose sum is σ = 8578356019200. Its totient is φ = 373347532800.

The previous prime is 1861617098779. The next prime is 1861617098897. The reversal of 1861617098880 is 888907161681.

1861617098880 is a `hidden beast` number, since 1 + 8 + 6 + 1 + 617 + 0 + 9 + 8 + 8 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 4990930374 + ... + 4990930746.

It is an arithmetic number, because the mean of its divisors is an integer number (4188650400).

Almost surely, 2^{1861617098880} is an apocalyptic number.

1861617098880 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 1861617098880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4289178009600).

1861617098880 is an abundant number, since it is smaller than the sum of its proper divisors (6716738920320).

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

1861617098880 is a wasteful number, since it uses less digits than its factorization.

1861617098880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472 (or 432 counting only the distinct ones).

The product of its (nonzero) digits is 9289728, while the sum is 63.

The spelling of 1861617098880 in words is "one trillion, eight hundred sixty-one billion, six hundred seventeen million, ninety-eight thousand, eight hundred eighty".