31661455240 has 32 divisors (see below), whose sum is σ = 71692035480. Its totient is φ = 12583913472.

The previous prime is 31661455237. The next prime is 31661455247. The reversal of 31661455240 is 4255416613.

It can be written as a sum of positive squares in 4 ways, for example, as 25854710436 + 5806744804 = 160794^2 + 76202^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31661455240.

It is not an unprimeable number, because it can be changed into a prime (31661455247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2514537 + ... + 2527096.

Almost surely, 2^31661455240 is an apocalyptic number.

It is an amenable number.

31661455240 is an abundant number, since it is smaller than the sum of its proper divisors (40030580240).

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

31661455240 is a wasteful number, since it uses less digits than its factorization.

31661455240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5041801 (or 5041797 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 31661455240 in words is "thirty-one billion, six hundred sixty-one million, four hundred fifty-five thousand, two hundred forty".