240618208891 has 2 divisors, whose sum is σ = 240618208892. Its totient is φ = 240618208890.

The previous prime is 240618208763. The next prime is 240618208907. The reversal of 240618208891 is 198802816042.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 240618208891 - 2⁷ = 240618208763 is a prime.

It is a super-2 number, since 2×240618208891² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (240618218891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120309104445 + 120309104446.

It is an arithmetic number, because the mean of its divisors is an integer number (120309104446).

Almost surely, 2^240618208891 is an apocalyptic number.

240618208891 is a deficient number, since it is larger than the sum of its proper divisors (1).

240618208891 is an equidigital number, since it uses as much as digits as its factorization.

240618208891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 442368, while the sum is 49.

The spelling of 240618208891 in words is "two hundred forty billion, six hundred eighteen million, two hundred eight thousand, eight hundred ninety-one".