240499618318261 has 2 divisors, whose sum is σ = 240499618318262. Its totient is φ = 240499618318260.

The previous prime is 240499618318147. The next prime is 240499618318277. The reversal of 240499618318261 is 162813816994042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149123321099236 + 91376297219025 = 12211606^2 + 9559095^2 .

It is a cyclic number.

It is not a de Polignac number, because 240499618318261 - 2⁷ = 240499618318133 is a prime.

It is a super-2 number, since 2×240499618318261² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 240499618318193 and 240499618318202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (240499618358261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120249809159130 + 120249809159131.

It is an arithmetic number, because the mean of its divisors is an integer number (120249809159131).

Almost surely, 2^{240499618318261} is an apocalyptic number.

It is an amenable number.

240499618318261 is a deficient number, since it is larger than the sum of its proper divisors (1).

240499618318261 is an equidigital number, since it uses as much as digits as its factorization.

240499618318261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35831808, while the sum is 64.

The spelling of 240499618318261 in words is "two hundred forty trillion, four hundred ninety-nine billion, six hundred eighteen million, three hundred eighteen thousand, two hundred sixty-one".