263330578081 has 2 divisors, whose sum is σ = 263330578082. Its totient is φ = 263330578080.

The previous prime is 263330577967. The next prime is 263330578117. The reversal of 263330578081 is 180875033362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 220298809600 + 43031768481 = 469360^2 + 207441^2 .

It is a cyclic number.

It is not a de Polignac number, because 263330578081 - 2²⁷ = 263196360353 is a prime.

It is a super-2 number, since 2×263330578081² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (263330578481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131665289040 + 131665289041.

It is an arithmetic number, because the mean of its divisors is an integer number (131665289041).

Almost surely, 2^263330578081 is an apocalyptic number.

It is an amenable number.

263330578081 is a deficient number, since it is larger than the sum of its proper divisors (1).

263330578081 is an equidigital number, since it uses as much as digits as its factorization.

263330578081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 46.

The spelling of 263330578081 in words is "two hundred sixty-three billion, three hundred thirty million, five hundred seventy-eight thousand, eighty-one".