13515542243081 has 2 divisors, whose sum is σ = 13515542243082. Its totient is φ = 13515542243080.

The previous prime is 13515542243023. The next prime is 13515542243107. The reversal of 13515542243081 is 18034224551531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13337724847225 + 177817395856 = 3652085^2 + 421684^2 .

It is a cyclic number.

It is not a de Polignac number, because 13515542243081 - 2⁴² = 9117495731977 is a prime.

It is a super-2 number, since 2×13515542243081² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13515542243881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6757771121540 + 6757771121541.

It is an arithmetic number, because the mean of its divisors is an integer number (6757771121541).

Almost surely, 2^{13515542243081} is an apocalyptic number.

It is an amenable number.

13515542243081 is a deficient number, since it is larger than the sum of its proper divisors (1).

13515542243081 is an equidigital number, since it uses as much as digits as its factorization.

13515542243081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576000, while the sum is 44.

The spelling of 13515542243081 in words is "thirteen trillion, five hundred fifteen billion, five hundred forty-two million, two hundred forty-three thousand, eighty-one".