2111631606442 has 4 divisors (see below), whose sum is σ = 3167447409666. Its totient is φ = 1055815803220.

The previous prime is 2111631606437. The next prime is 2111631606493. The reversal of 2111631606442 is 2446061361112.

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., 1533954083841 + 577677522601 = 1238529^2 + 760051^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 527907901609 + ... + 527907901612.

Almost surely, 2^{2111631606442} is an apocalyptic number.

2111631606442 is a deficient number, since it is larger than the sum of its proper divisors (1055815803224).

2111631606442 is a wasteful number, since it uses less digits than its factorization.

2111631606442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055815803223.

The product of its (nonzero) digits is 41472, while the sum is 37.

Adding to 2111631606442 its reverse (2446061361112), we get a palindrome (4557692967554).

The spelling of 2111631606442 in words is "two trillion, one hundred eleven billion, six hundred thirty-one million, six hundred six thousand, four hundred forty-two".