911638407649 has 4 divisors (see below), whose sum is σ = 911732429764. Its totient is φ = 911544385536.

The previous prime is 911638407619. The next prime is 911638407689. The reversal of 911638407649 is 946704836119.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 616727502400 + 294910905249 = 785320^2 + 543057^2 .

It is a 3-Lehmer number, since φ(911638407649) divides (911638407649-1)³.

It is a cyclic number.

It is not a de Polignac number, because 911638407649 - 2⁹ = 911638407137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 911638407593 and 911638407602.

It is not an unprimeable number, because it can be changed into a prime (911638407619) by changing a digit.

It is a nontrivial repunit in base 9696.

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 in 3 ways as a sum of consecutive naturals, for example, 46996512 + ... + 47015905.

It is an arithmetic number, because the mean of its divisors is an integer number (227933107441).

Almost surely, 2^911638407649 is an apocalyptic number.

It is an amenable number.

911638407649 is a deficient number, since it is larger than the sum of its proper divisors (94022115).

911638407649 is an equidigital number, since it uses as much as digits as its factorization.

911638407649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94022114.

The product of its (nonzero) digits is 7838208, while the sum is 58.

The spelling of 911638407649 in words is "nine hundred eleven billion, six hundred thirty-eight million, four hundred seven thousand, six hundred forty-nine".