20551756685113 has 4 divisors (see below), whose sum is σ = 20553114237520. Its totient is φ = 20550399132708.

The previous prime is 20551756685107. The next prime is 20551756685137. The reversal of 20551756685113 is 31158665715502.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20551756685113 - 2¹⁷ = 20551756554041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20551756685183) 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, 678753495 + ... + 678783772.

It is an arithmetic number, because the mean of its divisors is an integer number (5138278559380).

Almost surely, 2^{20551756685113} is an apocalyptic number.

It is an amenable number.

20551756685113 is a deficient number, since it is larger than the sum of its proper divisors (1357552407).

20551756685113 is a wasteful number, since it uses less digits than its factorization.

20551756685113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1357552406.

The product of its (nonzero) digits is 7560000, while the sum is 55.

The spelling of 20551756685113 in words is "twenty trillion, five hundred fifty-one billion, seven hundred fifty-six million, six hundred eighty-five thousand, one hundred thirteen".