981693518418 has 24 divisors (see below), whose sum is σ = 2252120425308. Its totient is φ = 307982280192.

The previous prime is 981693518411. The next prime is 981693518419. The reversal of 981693518418 is 814815396189.

981693518418 is a `hidden beast` number, since 9 + 8 + 16 + 93 + 518 + 4 + 18 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 931296411369 + 50397107049 = 965037^2 + 224493^2 .

It is not an unprimeable number, because it can be changed into a prime (981693518411) 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 11 ways as a sum of consecutive naturals, for example, 1604074071 + ... + 1604074682.

Almost surely, 2^981693518418 is an apocalyptic number.

981693518418 is an abundant number, since it is smaller than the sum of its proper divisors (1270426906890).

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

981693518418 is a wasteful number, since it uses less digits than its factorization.

981693518418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3208148778 (or 3208148775 counting only the distinct ones).

The product of its digits is 14929920, while the sum is 63.

The spelling of 981693518418 in words is "nine hundred eighty-one billion, six hundred ninety-three million, five hundred eighteen thousand, four hundred eighteen".