1641863855140 has 48 divisors (see below), whose sum is σ = 3454480753920. Its totient is φ = 655495424640.

The previous prime is 1641863855131. The next prime is 1641863855167. The reversal of 1641863855140 is 415583681461.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43053001 + ... + 43091119.

It is an arithmetic number, because the mean of its divisors is an integer number (71968349040).

Almost surely, 2^{1641863855140} is an apocalyptic number.

1641863855140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1641863855140 is an abundant number, since it is smaller than the sum of its proper divisors (1812616898780).

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

1641863855140 is a wasteful number, since it uses less digits than its factorization.

1641863855140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42172 (or 42170 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 52.

The spelling of 1641863855140 in words is "one trillion, six hundred forty-one billion, eight hundred sixty-three million, eight hundred fifty-five thousand, one hundred forty".