11551222057 has 2 divisors, whose sum is σ = 11551222058. Its totient is φ = 11551222056.

The previous prime is 11551222019. The next prime is 11551222097. The reversal of 11551222057 is 75022215511.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9825567376 + 1725654681 = 99124^2 + 41541^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11551222057 is a prime.

It is a super-2 number, since 2×11551222057² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11551222097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5775611028 + 5775611029.

It is an arithmetic number, because the mean of its divisors is an integer number (5775611029).

Almost surely, 2^11551222057 is an apocalyptic number.

It is an amenable number.

11551222057 is a deficient number, since it is larger than the sum of its proper divisors (1).

11551222057 is an equidigital number, since it uses as much as digits as its factorization.

11551222057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7000, while the sum is 31.

Adding to 11551222057 its reverse (75022215511), we get a palindrome (86573437568).

The spelling of 11551222057 in words is "eleven billion, five hundred fifty-one million, two hundred twenty-two thousand, fifty-seven".