94581779521 has 2 divisors, whose sum is σ = 94581779522. Its totient is φ = 94581779520.

The previous prime is 94581779503. The next prime is 94581779549. The reversal of 94581779521 is 12597718549.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58304863296 + 36276916225 = 241464^2 + 190465^2 .

It is a cyclic number.

It is not a de Polignac number, because 94581779521 - 2⁹ = 94581779009 is a prime.

It is not a weakly prime, because it can be changed into another prime (94581779221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47290889760 + 47290889761.

It is an arithmetic number, because the mean of its divisors is an integer number (47290889761).

Almost surely, 2^94581779521 is an apocalyptic number.

It is an amenable number.

94581779521 is a deficient number, since it is larger than the sum of its proper divisors (1).

94581779521 is an equidigital number, since it uses as much as digits as its factorization.

94581779521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6350400, while the sum is 58.

The spelling of 94581779521 in words is "ninety-four billion, five hundred eighty-one million, seven hundred seventy-nine thousand, five hundred twenty-one".