11505000657121 has 2 divisors, whose sum is σ = 11505000657122. Its totient is φ = 11505000657120.

The previous prime is 11505000657103. The next prime is 11505000657127. The reversal of 11505000657121 is 12175600050511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6428450922721 + 5076549734400 = 2535439^2 + 2253120^2 .

It is a cyclic number.

It is not a de Polignac number, because 11505000657121 - 2¹⁷ = 11505000526049 is a prime.

It is not a weakly prime, because it can be changed into another prime (11505000657127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5752500328560 + 5752500328561.

It is an arithmetic number, because the mean of its divisors is an integer number (5752500328561).

Almost surely, 2^{11505000657121} is an apocalyptic number.

It is an amenable number.

11505000657121 is a deficient number, since it is larger than the sum of its proper divisors (1).

11505000657121 is an equidigital number, since it uses as much as digits as its factorization.

11505000657121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10500, while the sum is 34.

The spelling of 11505000657121 in words is "eleven trillion, five hundred five billion, six hundred fifty-seven thousand, one hundred twenty-one".