1981946045312 has 32 divisors (see below), whose sum is σ = 3948855890880. Its totient is φ = 990860645376.

The previous prime is 1981946045281. The next prime is 1981946045333. The reversal of 1981946045312 is 2135406491891.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×1981946045312² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260948 + ... + 2007980.

It is an arithmetic number, because the mean of its divisors is an integer number (123401746590).

Almost surely, 2^{1981946045312} is an apocalyptic number.

It is an amenable number.

1981946045312 is a deficient number, since it is larger than the sum of its proper divisors (1966909845568).

1981946045312 is an equidigital number, since it uses as much as digits as its factorization.

1981946045312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1755910 (or 1755898 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 53.

The spelling of 1981946045312 in words is "one trillion, nine hundred eighty-one billion, nine hundred forty-six million, forty-five thousand, three hundred twelve".