20155211155 has 16 divisors (see below), whose sum is σ = 24359892480. Its totient is φ = 16008696288.

The previous prime is 20155211143. The next prime is 20155211171. The reversal of 20155211155 is 55111255102.

It is a cyclic number.

It is not a de Polignac number, because 20155211155 - 2¹⁷ = 20155080083 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 557974 + ... + 592996.

It is an arithmetic number, because the mean of its divisors is an integer number (1522493280).

Almost surely, 2^20155211155 is an apocalyptic number.

20155211155 is a deficient number, since it is larger than the sum of its proper divisors (4204681325).

20155211155 is a wasteful number, since it uses less digits than its factorization.

20155211155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35850.

The product of its (nonzero) digits is 2500, while the sum is 28.

Adding to 20155211155 its reverse (55111255102), we get a palindrome (75266466257).

The spelling of 20155211155 in words is "twenty billion, one hundred fifty-five million, two hundred eleven thousand, one hundred fifty-five".