101778624991 has 2 divisors, whose sum is σ = 101778624992. Its totient is φ = 101778624990.

The previous prime is 101778624971. The next prime is 101778625027. The reversal of 101778624991 is 199426877101.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 101778624991 - 2²⁹ = 101241754079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101778624911) 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, 50889312495 + 50889312496.

It is an arithmetic number, because the mean of its divisors is an integer number (50889312496).

Almost surely, 2^101778624991 is an apocalyptic number.

101778624991 is a deficient number, since it is larger than the sum of its proper divisors (1).

101778624991 is an equidigital number, since it uses as much as digits as its factorization.

101778624991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1524096, while the sum is 55.

The spelling of 101778624991 in words is "one hundred one billion, seven hundred seventy-eight million, six hundred twenty-four thousand, nine hundred ninety-one".