1986663947742 has 24 divisors (see below), whose sum is σ = 4308292167816. Its totient is φ = 661628452176.

The previous prime is 1986663947731. The next prime is 1986663947743. The reversal of 1986663947742 is 2477493666891.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1986663947743) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49384648 + ... + 49424859.

It is an arithmetic number, because the mean of its divisors is an integer number (179512173659).

Almost surely, 2^{1986663947742} is an apocalyptic number.

1986663947742 is an abundant number, since it is smaller than the sum of its proper divisors (2321628220074).

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

1986663947742 is a wasteful number, since it uses less digits than its factorization.

1986663947742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98810632 (or 98810629 counting only the distinct ones).

The product of its digits is 658409472, while the sum is 72.

The spelling of 1986663947742 in words is "one trillion, nine hundred eighty-six billion, six hundred sixty-three million, nine hundred forty-seven thousand, seven hundred forty-two".