11555204387 has 2 divisors, whose sum is σ = 11555204388. Its totient is φ = 11555204386.

The previous prime is 11555204333. The next prime is 11555204431. The reversal of 11555204387 is 78340255511.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11555204387 - 2⁸ = 11555204131 is a prime.

It is not a weakly prime, because it can be changed into another prime (11555200387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5777602193 + 5777602194.

It is an arithmetic number, because the mean of its divisors is an integer number (5777602194).

Almost surely, 2^11555204387 is an apocalyptic number.

11555204387 is a deficient number, since it is larger than the sum of its proper divisors (1).

11555204387 is an equidigital number, since it uses as much as digits as its factorization.

11555204387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168000, while the sum is 41.

Adding to 11555204387 its reverse (78340255511), we get a palindrome (89895459898).

The spelling of 11555204387 in words is "eleven billion, five hundred fifty-five million, two hundred four thousand, three hundred eighty-seven".