100254778489 has 2 divisors, whose sum is σ = 100254778490. Its totient is φ = 100254778488.

The previous prime is 100254778433. The next prime is 100254778513. The reversal of 100254778489 is 984877452001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68139271225 + 32115507264 = 261035^2 + 179208^2 .

It is a cyclic number.

It is not a de Polignac number, because 100254778489 - 2²¹ = 100252681337 is a prime.

It is not a weakly prime, because it can be changed into another prime (100254878489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50127389244 + 50127389245.

It is an arithmetic number, because the mean of its divisors is an integer number (50127389245).

Almost surely, 2^100254778489 is an apocalyptic number.

It is an amenable number.

100254778489 is a deficient number, since it is larger than the sum of its proper divisors (1).

100254778489 is an equidigital number, since it uses as much as digits as its factorization.

100254778489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4515840, while the sum is 55.

The spelling of 100254778489 in words is "one hundred billion, two hundred fifty-four million, seven hundred seventy-eight thousand, four hundred eighty-nine".