100605550556081 has 2 divisors, whose sum is σ = 100605550556082. Its totient is φ = 100605550556080.

The previous prime is 100605550555999. The next prime is 100605550556101. The reversal of 100605550556081 is 180655055506001.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78109890480400 + 22495660075681 = 8837980^2 + 4742959^2 .

It is a cyclic number.

It is not a de Polignac number, because 100605550556081 - 2⁴⁶ = 30236806378417 is a prime.

It is a super-2 number, since 2×100605550556081² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (100605550556981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50302775278040 + 50302775278041.

It is an arithmetic number, because the mean of its divisors is an integer number (50302775278041).

Almost surely, 2^{100605550556081} is an apocalyptic number.

It is an amenable number.

100605550556081 is a deficient number, since it is larger than the sum of its proper divisors (1).

100605550556081 is an equidigital number, since it uses as much as digits as its factorization.

100605550556081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900000, while the sum is 47.

The spelling of 100605550556081 in words is "one hundred trillion, six hundred five billion, five hundred fifty million, five hundred fifty-six thousand, eighty-one".