210161430261 has 6 divisors (see below), whose sum is σ = 303566510390. Its totient is φ = 140107620168.

The previous prime is 210161430257. The next prime is 210161430277. The reversal of 210161430261 is 162034161012.

It is a happy number.

210161430261 is a `hidden beast` number, since 2 + 10 + 1 + 614 + 30 + 2 + 6 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 116754789636 + 93406640625 = 341694^2 + 305625^2 .

It is not a de Polignac number, because 210161430261 - 2² = 210161430257 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210161430361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11675635006 + ... + 11675635023.

Almost surely, 2^210161430261 is an apocalyptic number.

It is an amenable number.

210161430261 is a deficient number, since it is larger than the sum of its proper divisors (93405080129).

210161430261 is a wasteful number, since it uses less digits than its factorization.

210161430261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23351270035 (or 23351270032 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

Adding to 210161430261 its reverse (162034161012), we get a palindrome (372195591273).

The spelling of 210161430261 in words is "two hundred ten billion, one hundred sixty-one million, four hundred thirty thousand, two hundred sixty-one".