12261620520 has 48 divisors (see below), whose sum is σ = 39850267860. Its totient is φ = 3269765376.

The previous prime is 12261620507. The next prime is 12261620533. The reversal of 12261620520 is 2502616221.

12261620520 is a `hidden beast` number, since 1 + 2 + 2 + 616 + 20 + 5 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (12261620507) and next prime (12261620533).

It can be written as a sum of positive squares in 2 ways, for example, as 11613510756 + 648109764 = 107766^2 + 25458^2 .

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 11 ways as a sum of consecutive naturals, for example, 17029669 + ... + 17030388.

Almost surely, 2^12261620520 is an apocalyptic number.

12261620520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12261620520 is an abundant number, since it is smaller than the sum of its proper divisors (27588647340).

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

12261620520 is a wasteful number, since it uses less digits than its factorization.

12261620520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34060074 (or 34060067 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The spelling of 12261620520 in words is "twelve billion, two hundred sixty-one million, six hundred twenty thousand, five hundred twenty".