12520615155541 has 4 divisors (see below), whose sum is σ = 12520640260492. Its totient is φ = 12520590050592.

The previous prime is 12520615155527. The next prime is 12520615155553. The reversal of 12520615155541 is 14555151602521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1490179291441 + 11030435864100 = 1220729^2 + 3321210^2 .

It is a cyclic number.

It is not a de Polignac number, because 12520615155541 - 2¹³ = 12520615147349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12520615155341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11788896 + ... + 12807001.

It is an arithmetic number, because the mean of its divisors is an integer number (3130160065123).

Almost surely, 2^{12520615155541} is an apocalyptic number.

It is an amenable number.

12520615155541 is a deficient number, since it is larger than the sum of its proper divisors (25104951).

12520615155541 is an equidigital number, since it uses as much as digits as its factorization.

12520615155541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25104950.

The product of its (nonzero) digits is 300000, while the sum is 43.

The spelling of 12520615155541 in words is "twelve trillion, five hundred twenty billion, six hundred fifteen million, one hundred fifty-five thousand, five hundred forty-one".