215650161 has 8 divisors (see below), whose sum is σ = 319481760. Its totient is φ = 143766756.

The previous prime is 215650027. The next prime is 215650207. The reversal of 215650161 is 161056512.

It is a happy number.

215650161 is a `hidden beast` number, since 2 + 1 + 5 + 650 + 1 + 6 + 1 = 666.

It is not a de Polignac number, because 215650161 - 2²² = 211455857 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 7987043 = 215650161 / (2 + 1 + 5 + 6 + 5 + 0 + 1 + 6 + 1).

It is not an unprimeable number, because it can be changed into a prime (215650861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3993495 + ... + 3993548.

It is an arithmetic number, because the mean of its divisors is an integer number (39935220).

Almost surely, 2^215650161 is an apocalyptic number.

It is an amenable number.

215650161 is a deficient number, since it is larger than the sum of its proper divisors (103831599).

215650161 is an equidigital number, since it uses as much as digits as its factorization.

215650161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7987052 (or 7987046 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 215650161 is about 14685.0318692198. The cubic root of 215650161 is about 599.6758999635.

The spelling of 215650161 in words is "two hundred fifteen million, six hundred fifty thousand, one hundred sixty-one".