12520615155540 has 96 divisors (see below), whose sum is σ = 36711237298176. Its totient is φ = 3182379024000.

The previous prime is 12520615155527. The next prime is 12520615155553. The reversal of 12520615155540 is 4555151602521.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (12520615155527) and next prime (12520615155553).

It is a junction number, because it is equal to n+sod(n) for n = 12520615155492 and 12520615155501.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15639336 + ... + 16420415.

It is an arithmetic number, because the mean of its divisors is an integer number (382408721856).

Almost surely, 2^{12520615155540} is an apocalyptic number.

12520615155540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12520615155540 is an abundant number, since it is smaller than the sum of its proper divisors (24190622142636).

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

12520615155540 is a wasteful number, since it uses less digits than its factorization.

12520615155540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32060069 (or 32060067 counting only the distinct ones).

The product of its (nonzero) digits is 300000, while the sum is 42.

The spelling of 12520615155540 in words is "twelve trillion, five hundred twenty billion, six hundred fifteen million, one hundred fifty-five thousand, five hundred forty".