11521554257 has 2 divisors, whose sum is σ = 11521554258. Its totient is φ = 11521554256.

The previous prime is 11521554227. The next prime is 11521554263. The reversal of 11521554257 is 75245512511.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11313300496 + 208253761 = 106364^2 + 14431^2 .

It is a cyclic number.

It is not a de Polignac number, because 11521554257 - 2¹⁶ = 11521488721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11521554257.

It is not a weakly prime, because it can be changed into another prime (11521554227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5760777128 + 5760777129.

It is an arithmetic number, because the mean of its divisors is an integer number (5760777129).

Almost surely, 2^11521554257 is an apocalyptic number.

It is an amenable number.

11521554257 is a deficient number, since it is larger than the sum of its proper divisors (1).

11521554257 is an equidigital number, since it uses as much as digits as its factorization.

11521554257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70000, while the sum is 38.

The spelling of 11521554257 in words is "eleven billion, five hundred twenty-one million, five hundred fifty-four thousand, two hundred fifty-seven".