20511240056651 has 8 divisors (see below), whose sum is σ = 20793049851840. Its totient is φ = 20229452799552.

The previous prime is 20511240056639. The next prime is 20511240056677. The reversal of 20511240056651 is 15665004211502.

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-20511240056651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20511240056621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3797795 + ... + 7446188.

It is an arithmetic number, because the mean of its divisors is an integer number (2599131231480).

Almost surely, 2^{20511240056651} is an apocalyptic number.

20511240056651 is a deficient number, since it is larger than the sum of its proper divisors (281809795189).

20511240056651 is a wasteful number, since it uses less digits than its factorization.

20511240056651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11269045.

The product of its (nonzero) digits is 72000, while the sum is 38.

The spelling of 20511240056651 in words is "twenty trillion, five hundred eleven billion, two hundred forty million, fifty-six thousand, six hundred fifty-one".