188243679454261 has 2 divisors, whose sum is σ = 188243679454262. Its totient is φ = 188243679454260.

The previous prime is 188243679454231. The next prime is 188243679454319. The reversal of 188243679454261 is 162454976342881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 170704285198225 + 17539394256036 = 13065385^2 + 4188006^2 .

It is a cyclic number.

It is not a de Polignac number, because 188243679454261 - 2⁹ = 188243679453749 is a prime.

It is a super-2 number, since 2×188243679454261² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188243679454231) 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, 94121839727130 + 94121839727131.

It is an arithmetic number, because the mean of its divisors is an integer number (94121839727131).

Almost surely, 2^{188243679454261} is an apocalyptic number.

It is an amenable number.

188243679454261 is a deficient number, since it is larger than the sum of its proper divisors (1).

188243679454261 is an equidigital number, since it uses as much as digits as its factorization.

188243679454261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 557383680, while the sum is 70.

The spelling of 188243679454261 in words is "one hundred eighty-eight trillion, two hundred forty-three billion, six hundred seventy-nine million, four hundred fifty-four thousand, two hundred sixty-one".