12621025616 has 10 divisors (see below), whose sum is σ = 24453237162. Its totient is φ = 6310512800.

The previous prime is 12621025609. The next prime is 12621025619. The reversal of 12621025616 is 61652012621.

It can be written as a sum of positive squares in only one way, i.e., 6364848400 + 6256177216 = 79780^2 + 79096^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12621025619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 394407035 + ... + 394407066.

Almost surely, 2^12621025616 is an apocalyptic number.

12621025616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12621025616 is a deficient number, since it is larger than the sum of its proper divisors (11832211546).

12621025616 is an equidigital number, since it uses as much as digits as its factorization.

12621025616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788814109 (or 788814103 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The spelling of 12621025616 in words is "twelve billion, six hundred twenty-one million, twenty-five thousand, six hundred sixteen".