2515666226081 has 2 divisors, whose sum is σ = 2515666226082. Its totient is φ = 2515666226080.

The previous prime is 2515666226057. The next prime is 2515666226137. The reversal of 2515666226081 is 1806226665152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2030810254225 + 484855971856 = 1425065^2 + 696316^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2515666226081 is a prime.

It is a super-2 number, since 2×2515666226081² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2515666226581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1257833113040 + 1257833113041.

It is an arithmetic number, because the mean of its divisors is an integer number (1257833113041).

Almost surely, 2^{2515666226081} is an apocalyptic number.

It is an amenable number.

2515666226081 is a deficient number, since it is larger than the sum of its proper divisors (1).

2515666226081 is an equidigital number, since it uses as much as digits as its factorization.

2515666226081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2073600, while the sum is 50.

The spelling of 2515666226081 in words is "two trillion, five hundred fifteen billion, six hundred sixty-six million, two hundred twenty-six thousand, eighty-one".