118431628561 has 2 divisors, whose sum is σ = 118431628562. Its totient is φ = 118431628560.

The previous prime is 118431628489. The next prime is 118431628577. The reversal of 118431628561 is 165826134811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118005990400 + 425638161 = 343520^2 + 20631^2 .

It is an emirp because it is prime and its reverse (165826134811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 118431628561 - 2¹³ = 118431620369 is a prime.

It is a super-2 number, since 2×118431628561² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (118431628061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59215814280 + 59215814281.

It is an arithmetic number, because the mean of its divisors is an integer number (59215814281).

Almost surely, 2^118431628561 is an apocalyptic number.

It is an amenable number.

118431628561 is a deficient number, since it is larger than the sum of its proper divisors (1).

118431628561 is an equidigital number, since it uses as much as digits as its factorization.

118431628561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 276480, while the sum is 46.

The spelling of 118431628561 in words is "one hundred eighteen billion, four hundred thirty-one million, six hundred twenty-eight thousand, five hundred sixty-one".