31660423433 has 4 divisors (see below), whose sum is σ = 33522801300. Its totient is φ = 29798045568.

The previous prime is 31660423367. The next prime is 31660423469. The reversal of 31660423433 is 33432406613.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33432406613 = 31489 ⋅1061717.

It can be written as a sum of positive squares in 2 ways, for example, as 20552949769 + 11107473664 = 143363^2 + 105392^2 .

It is a cyclic number.

It is not a de Polignac number, because 31660423433 - 2⁸ = 31660423177 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31660423393 and 31660423402.

It is not an unprimeable number, because it can be changed into a prime (31660423133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 931188908 + ... + 931188941.

It is an arithmetic number, because the mean of its divisors is an integer number (8380700325).

Almost surely, 2^31660423433 is an apocalyptic number.

It is an amenable number.

31660423433 is a deficient number, since it is larger than the sum of its proper divisors (1862377867).

31660423433 is a wasteful number, since it uses less digits than its factorization.

31660423433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1862377866.

The product of its (nonzero) digits is 93312, while the sum is 35.

The spelling of 31660423433 in words is "thirty-one billion, six hundred sixty million, four hundred twenty-three thousand, four hundred thirty-three".