31661140763111 has 4 divisors (see below), whose sum is σ = 31661152213224. Its totient is φ = 31661129313000.

The previous prime is 31661140763099. The next prime is 31661140763159. The reversal of 31661140763111 is 11136704116613.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 31661140763111 - 2⁴² = 27263094252007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31661140760111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1278536 + ... + 8059586.

It is an arithmetic number, because the mean of its divisors is an integer number (7915288053306).

Almost surely, 2^{31661140763111} is an apocalyptic number.

31661140763111 is a deficient number, since it is larger than the sum of its proper divisors (11450113).

31661140763111 is an equidigital number, since it uses as much as digits as its factorization.

31661140763111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11450112.

The product of its (nonzero) digits is 54432, while the sum is 41.

Adding to 31661140763111 its reverse (11136704116613), we get a palindrome (42797844879724).

The spelling of 31661140763111 in words is "thirty-one trillion, six hundred sixty-one billion, one hundred forty million, seven hundred sixty-three thousand, one hundred eleven".