1981167716442 has 64 divisors (see below), whose sum is σ = 4039069224960. Its totient is φ = 647655188544.

The previous prime is 1981167716431. The next prime is 1981167716443. The reversal of 1981167716442 is 2446177611891.

It is not an unprimeable number, because it can be changed into a prime (1981167716443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 400800223 + ... + 400805165.

It is an arithmetic number, because the mean of its divisors is an integer number (63110456640).

Almost surely, 2^{1981167716442} is an apocalyptic number.

1981167716442 is an abundant number, since it is smaller than the sum of its proper divisors (2057901508518).

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

1981167716442 is a wasteful number, since it uses less digits than its factorization.

1981167716442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7467.

The product of its digits is 4064256, while the sum is 57.

The spelling of 1981167716442 in words is "one trillion, nine hundred eighty-one billion, one hundred sixty-seven million, seven hundred sixteen thousand, four hundred forty-two".