20617755615755 has 8 divisors (see below), whose sum is σ = 25080228749472. Its totient is φ = 16268256485568.

The previous prime is 20617755615703. The next prime is 20617755615763. The reversal of 20617755615755 is 55751655771602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20617755615755 is a prime.

It is a super-4 number, since 4×20617755615755⁴ (a number of 54 digits) contains 4444 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 28243500479 + ... + 28243501208.

It is an arithmetic number, because the mean of its divisors is an integer number (3135028593684).

Almost surely, 2^{20617755615755} is an apocalyptic number.

20617755615755 is a deficient number, since it is larger than the sum of its proper divisors (4462473133717).

20617755615755 is an equidigital number, since it uses as much as digits as its factorization.

20617755615755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56487001765.

The product of its (nonzero) digits is 77175000, while the sum is 62.

The spelling of 20617755615755 in words is "twenty trillion, six hundred seventeen billion, seven hundred fifty-five million, six hundred fifteen thousand, seven hundred fifty-five".