118640558261 has 2 divisors, whose sum is σ = 118640558262. Its totient is φ = 118640558260.

The previous prime is 118640558189. The next prime is 118640558287. The reversal of 118640558261 is 162855046811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94436977636 + 24203580625 = 307306^2 + 155575^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-118640558261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118640558291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59320279130 + 59320279131.

It is an arithmetic number, because the mean of its divisors is an integer number (59320279131).

Almost surely, 2^118640558261 is an apocalyptic number.

It is an amenable number.

118640558261 is a deficient number, since it is larger than the sum of its proper divisors (1).

118640558261 is an equidigital number, since it uses as much as digits as its factorization.

118640558261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 460800, while the sum is 47.

The spelling of 118640558261 in words is "one hundred eighteen billion, six hundred forty million, five hundred fifty-eight thousand, two hundred sixty-one".