31661163503 has 2 divisors, whose sum is σ = 31661163504. Its totient is φ = 31661163502.

The previous prime is 31661163497. The next prime is 31661163533. The reversal of 31661163503 is 30536116613.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31661163503 - 2⁶ = 31661163439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31661163533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15830581751 + 15830581752.

It is an arithmetic number, because the mean of its divisors is an integer number (15830581752).

Almost surely, 2^31661163503 is an apocalyptic number.

31661163503 is a deficient number, since it is larger than the sum of its proper divisors (1).

31661163503 is an equidigital number, since it uses as much as digits as its factorization.

31661163503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 35.

The spelling of 31661163503 in words is "thirty-one billion, six hundred sixty-one million, one hundred sixty-three thousand, five hundred three".