2156986161 has 48 divisors (see below), whose sum is σ = 3575070720. Its totient is φ = 1240414560.

The previous prime is 2156986031. The next prime is 2156986171. The reversal of 2156986161 is 1616896512.

2156986161 is a `hidden beast` number, since 2 + 1 + 569 + 86 + 1 + 6 + 1 = 666.

It is not a de Polignac number, because 2156986161 - 2¹⁰ = 2156985137 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (2156986171) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 285450 + ... + 292908.

It is an arithmetic number, because the mean of its divisors is an integer number (74480640).

Almost surely, 2^2156986161 is an apocalyptic number.

It is an amenable number.

2156986161 is a deficient number, since it is larger than the sum of its proper divisors (1418084559).

2156986161 is a wasteful number, since it uses less digits than its factorization.

2156986161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7626 (or 7623 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 2156986161 is about 46443.3650912593. The cubic root of 2156986161 is about 1292.0593194288.

The spelling of 2156986161 in words is "two billion, one hundred fifty-six million, nine hundred eighty-six thousand, one hundred sixty-one".