20155645653 has 32 divisors (see below), whose sum is σ = 32168223360. Its totient is φ = 11063120640.

The previous prime is 20155645639. The next prime is 20155645669. The reversal of 20155645653 is 35654655102.

It is not a de Polignac number, because 20155645653 - 2⁸ = 20155645397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20155645613) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 420498 + ... + 465971.

It is an arithmetic number, because the mean of its divisors is an integer number (1005256980).

Almost surely, 2^20155645653 is an apocalyptic number.

It is an amenable number.

20155645653 is a deficient number, since it is larger than the sum of its proper divisors (12012577707).

20155645653 is a wasteful number, since it uses less digits than its factorization.

20155645653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 886549.

The product of its (nonzero) digits is 540000, while the sum is 42.

The spelling of 20155645653 in words is "twenty billion, one hundred fifty-five million, six hundred forty-five thousand, six hundred fifty-three".