31663661351 has 4 divisors (see below), whose sum is σ = 36187041552. Its totient is φ = 27140281152.

The previous prime is 31663661317. The next prime is 31663661353. The reversal of 31663661351 is 15316636613.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15316636613 = 3701 ⋅4138513.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31663661351 is a prime.

It is a super-2 number, since 2×31663661351² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31663661299 and 31663661308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31663661353) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2261690090 + ... + 2261690103.

It is an arithmetic number, because the mean of its divisors is an integer number (9046760388).

Almost surely, 2^31663661351 is an apocalyptic number.

31663661351 is a deficient number, since it is larger than the sum of its proper divisors (4523380201).

31663661351 is an equidigital number, since it uses as much as digits as its factorization.

31663661351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4523380200.

The product of its digits is 174960, while the sum is 41.

The spelling of 31663661351 in words is "thirty-one billion, six hundred sixty-three million, six hundred sixty-one thousand, three hundred fifty-one".