31112261665 has 16 divisors (see below), whose sum is σ = 38077848576. Its totient is φ = 24395342400.

The previous prime is 31112261641. The next prime is 31112261689. The reversal of 31112261665 is 56616221113.

It is an interprime number because it is at equal distance from previous prime (31112261641) and next prime (31112261689).

It is not a de Polignac number, because 31112261665 - 2²¹ = 31110164513 is a prime.

It is a super-2 number, since 2×31112261665² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31112261665.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 203380 + ... + 321850.

It is an arithmetic number, because the mean of its divisors is an integer number (2379865536).

Almost surely, 2^31112261665 is an apocalyptic number.

It is an amenable number.

31112261665 is a deficient number, since it is larger than the sum of its proper divisors (6965586911).

31112261665 is a wasteful number, since it uses less digits than its factorization.

31112261665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119520.

The product of its digits is 12960, while the sum is 34.

Adding to 31112261665 its reverse (56616221113), we get a palindrome (87728482778).

The spelling of 31112261665 in words is "thirty-one billion, one hundred twelve million, two hundred sixty-one thousand, six hundred sixty-five".