20160155561 has 32 divisors (see below), whose sum is σ = 26725923840. Its totient is φ = 14759889984.

The previous prime is 20160155539. The next prime is 20160155567. The reversal of 20160155561 is 16555106102.

It is not a de Polignac number, because 20160155561 - 2⁶ = 20160155497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20160155567) 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, 61235 + ... + 209928.

It is an arithmetic number, because the mean of its divisors is an integer number (835185120).

Almost surely, 2^20160155561 is an apocalyptic number.

It is an amenable number.

20160155561 is a deficient number, since it is larger than the sum of its proper divisors (6565768279).

20160155561 is a wasteful number, since it uses less digits than its factorization.

20160155561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271245.

The product of its (nonzero) digits is 9000, while the sum is 32.

The spelling of 20160155561 in words is "twenty billion, one hundred sixty million, one hundred fifty-five thousand, five hundred sixty-one".