31656516506 has 4 divisors (see below), whose sum is σ = 47484774762. Its totient is φ = 15828258252.

The previous prime is 31656516473. The next prime is 31656516547. The reversal of 31656516506 is 60561565613.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60561565613 = 15731 ⋅3849823.

It can be written as a sum of positive squares in only one way, i.e., 27312520225 + 4343996281 = 165265^2 + 65909^2 .

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 as a sum of consecutive naturals, namely, 7914129125 + ... + 7914129128.

Almost surely, 2^31656516506 is an apocalyptic number.

31656516506 is a deficient number, since it is larger than the sum of its proper divisors (15828258256).

31656516506 is a wasteful number, since it uses less digits than its factorization.

31656516506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15828258255.

The product of its (nonzero) digits is 486000, while the sum is 44.

The spelling of 31656516506 in words is "thirty-one billion, six hundred fifty-six million, five hundred sixteen thousand, five hundred six".