11515151213557 has 2 divisors, whose sum is σ = 11515151213558. Its totient is φ = 11515151213556.

The previous prime is 11515151213459. The next prime is 11515151213603. The reversal of 11515151213557 is 75531215151511.

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., 6761294862001 + 4753856351556 = 2600249^2 + 2180334^2 .

It is a cyclic number.

It is not a de Polignac number, because 11515151213557 - 2³⁹ = 10965395399669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11515151913557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5757575606778 + 5757575606779.

It is an arithmetic number, because the mean of its divisors is an integer number (5757575606779).

Almost surely, 2^{11515151213557} is an apocalyptic number.

It is an amenable number.

11515151213557 is a deficient number, since it is larger than the sum of its proper divisors (1).

11515151213557 is an equidigital number, since it uses as much as digits as its factorization.

11515151213557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 131250, while the sum is 43.

The spelling of 11515151213557 in words is "eleven trillion, five hundred fifteen billion, one hundred fifty-one million, two hundred thirteen thousand, five hundred fifty-seven".