1781019916918 has 16 divisors (see below), whose sum is σ = 2914806442320. Its totient is φ = 809440559200.

The previous prime is 1781019916913. The next prime is 1781019916967. The reversal of 1781019916918 is 8196199101871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1781019916913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5537473 + ... + 5850268.

It is an arithmetic number, because the mean of its divisors is an integer number (182175402645).

Almost surely, 2^{1781019916918} is an apocalyptic number.

1781019916918 is a deficient number, since it is larger than the sum of its proper divisors (1133786525402).

1781019916918 is a wasteful number, since it uses less digits than its factorization.

1781019916918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11394863.

The product of its (nonzero) digits is 1959552, while the sum is 61.

The spelling of 1781019916918 in words is "one trillion, seven hundred eighty-one billion, nineteen million, nine hundred sixteen thousand, nine hundred eighteen".