1618861889000 has 32 divisors (see below), whose sum is σ = 3788136822600. Its totient is φ = 647544755200.

The previous prime is 1618861888981. The next prime is 1618861889017. The reversal of 1618861889000 is 9881688161.

It can be written as a sum of positive squares in 4 ways, for example, as 481699850116 + 1137162038884 = 694046^2 + 1066378^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 809429945 + ... + 809431944.

Almost surely, 2^{1618861889000} is an apocalyptic number.

1618861889000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1618861889000 is an abundant number, since it is smaller than the sum of its proper divisors (2169274933600).

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

1618861889000 is a wasteful number, since it uses less digits than its factorization.

1618861889000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1618861910 (or 1618861896 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 56.

The spelling of 1618861889000 in words is "one trillion, six hundred eighteen billion, eight hundred sixty-one million, eight hundred eighty-nine thousand".