12662533640 has 32 divisors (see below), whose sum is σ = 30166625880. Its totient is φ = 4767071232.

The previous prime is 12662533619. The next prime is 12662533673. The reversal of 12662533640 is 4633526621.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9796644484 + 2865889156 = 98978^2 + 53534^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12662533594 and 12662533603.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 9310007 + ... + 9311366.

Almost surely, 2^12662533640 is an apocalyptic number.

12662533640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12662533640 is an abundant number, since it is smaller than the sum of its proper divisors (17504092240).

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

12662533640 is a wasteful number, since it uses less digits than its factorization.

12662533640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18621401 (or 18621397 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 38.

The spelling of 12662533640 in words is "twelve billion, six hundred sixty-two million, five hundred thirty-three thousand, six hundred forty".