100078000261 has 2 divisors, whose sum is σ = 100078000262. Its totient is φ = 100078000260.

The previous prime is 100078000199. The next prime is 100078000339. The reversal of 100078000261 is 162000870001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61067800161 + 39010200100 = 247119^2 + 197510^2 .

It is a cyclic number.

It is not a de Polignac number, because 100078000261 - 2¹⁹ = 100077475973 is a prime.

It is a super-2 number, since 2×100078000261² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100078006261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50039000130 + 50039000131.

It is an arithmetic number, because the mean of its divisors is an integer number (50039000131).

Almost surely, 2^100078000261 is an apocalyptic number.

100078000261 is the 141477-th centered decagonal number.

It is an amenable number.

100078000261 is a deficient number, since it is larger than the sum of its proper divisors (1).

100078000261 is an equidigital number, since it uses as much as digits as its factorization.

100078000261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 25.

Adding to 100078000261 its reverse (162000870001), we get a palindrome (262078870262).

The spelling of 100078000261 in words is "one hundred billion, seventy-eight million, two hundred sixty-one", and thus it is an aban number.