20415766923359 has 4 divisors (see below), whose sum is σ = 20613978252816. Its totient is φ = 20217555593904.

The previous prime is 20415766923353. The next prime is 20415766923361. The reversal of 20415766923359 is 95332966751402.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20415766923359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20415766923353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99105664574 + ... + 99105664779.

It is an arithmetic number, because the mean of its divisors is an integer number (5153494563204).

Almost surely, 2^{20415766923359} is an apocalyptic number.

20415766923359 is a deficient number, since it is larger than the sum of its proper divisors (198211329457).

20415766923359 is a wasteful number, since it uses less digits than its factorization.

20415766923359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198211329456.

The product of its (nonzero) digits is 73483200, while the sum is 62.

The spelling of 20415766923359 in words is "twenty trillion, four hundred fifteen billion, seven hundred sixty-six million, nine hundred twenty-three thousand, three hundred fifty-nine".