31768166477 has 4 divisors (see below), whose sum is σ = 31768523100. Its totient is φ = 31767809856.

The previous prime is 31768166473. The next prime is 31768166519. The reversal of 31768166477 is 77466186713.

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, and also an emirpimes, since its reverse is a distinct semiprime: 77466186713 = 3533 ⋅21926461.

It can be written as a sum of positive squares in 2 ways, for example, as 25821597481 + 5946568996 = 160691^2 + 77114^2 .

It is a cyclic number.

It is not a de Polignac number, because 31768166477 - 2² = 31768166473 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 (31768166471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81413 + ... + 264885.

It is an arithmetic number, because the mean of its divisors is an integer number (7942130775).

Almost surely, 2^31768166477 is an apocalyptic number.

It is an amenable number.

31768166477 is a deficient number, since it is larger than the sum of its proper divisors (356623).

31768166477 is a wasteful number, since it uses less digits than its factorization.

31768166477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356622.

The product of its digits is 7112448, while the sum is 56.

The spelling of 31768166477 in words is "thirty-one billion, seven hundred sixty-eight million, one hundred sixty-six thousand, four hundred seventy-seven".