20766509494899 has 16 divisors (see below), whose sum is σ = 31668985099008. Its totient is φ = 11857284296352.

The previous prime is 20766509494873. The next prime is 20766509494921. The reversal of 20766509494899 is 99849490566702.

It is not a de Polignac number, because 20766509494899 - 2¹¹ = 20766509492851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20766509294899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 387162457 + ... + 387216090.

It is an arithmetic number, because the mean of its divisors is an integer number (1979311568688).

Almost surely, 2^{20766509494899} is an apocalyptic number.

20766509494899 is a deficient number, since it is larger than the sum of its proper divisors (10902475604109).

20766509494899 is a wasteful number, since it uses less digits than its factorization.

20766509494899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774379834.

The product of its (nonzero) digits is 2116316160, while the sum is 78.

The spelling of 20766509494899 in words is "twenty trillion, seven hundred sixty-six billion, five hundred nine million, four hundred ninety-four thousand, eight hundred ninety-nine".