31133666536 has 48 divisors (see below), whose sum is σ = 67827071520. Its totient is φ = 13124174400.

The previous prime is 31133666461. The next prime is 31133666569. The reversal of 31133666536 is 63566633113.

It is a junction number, because it is equal to n+sod(n) for n = 31133666492 and 31133666501.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 133671 + ... + 283081.

It is an arithmetic number, because the mean of its divisors is an integer number (1413063990).

Almost surely, 2^31133666536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31133666536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33913535760).

31133666536 is an abundant number, since it is smaller than the sum of its proper divisors (36693404984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31133666536 is a wasteful number, since it uses less digits than its factorization.

31133666536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149546 (or 149481 counting only the distinct ones).

The product of its digits is 524880, while the sum is 43.

The spelling of 31133666536 in words is "thirty-one billion, one hundred thirty-three million, six hundred sixty-six thousand, five hundred thirty-six".