1988806449442 has 4 divisors (see below), whose sum is σ = 2983209674166. Its totient is φ = 994403224720.

The previous prime is 1988806449419. The next prime is 1988806449473. The reversal of 1988806449442 is 2449446088891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1493965953841 + 494840495601 = 1222279^2 + 703449^2 .

It is a super-2 number, since 2×1988806449442² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497201612359 + ... + 497201612362.

Almost surely, 2^{1988806449442} is an apocalyptic number.

1988806449442 is a deficient number, since it is larger than the sum of its proper divisors (994403224724).

1988806449442 is an equidigital number, since it uses as much as digits as its factorization.

1988806449442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 994403224723.

The product of its (nonzero) digits is 127401984, while the sum is 67.

The spelling of 1988806449442 in words is "one trillion, nine hundred eighty-eight billion, eight hundred six million, four hundred forty-nine thousand, four hundred forty-two".