20165606651 has 8 divisors (see below), whose sum is σ = 20444502144. Its totient is φ = 19886783040.

The previous prime is 20165606647. The next prime is 20165606653. The reversal of 20165606651 is 15660656102.

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

It is a cyclic number.

It is not a de Polignac number, because 20165606651 - 2² = 20165606647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20165606653) by changing a digit.

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, 805046 + ... + 829716.

It is an arithmetic number, because the mean of its divisors is an integer number (2555562768).

Almost surely, 2^20165606651 is an apocalyptic number.

20165606651 is a deficient number, since it is larger than the sum of its proper divisors (278895493).

20165606651 is a wasteful number, since it uses less digits than its factorization.

20165606651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35941.

The product of its (nonzero) digits is 64800, while the sum is 38.

The spelling of 20165606651 in words is "twenty billion, one hundred sixty-five million, six hundred six thousand, six hundred fifty-one".