261564205230212 has 6 divisors (see below), whose sum is σ = 457737359152878. Its totient is φ = 130782102615104.

The previous prime is 261564205230187. The next prime is 261564205230281. The reversal of 261564205230212 is 212032502465162.

It can be written as a sum of positive squares in only one way, i.e., 240035032108096 + 21529173122116 = 15493064^2 + 4639954^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 261564205230212.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32695525653773 + ... + 32695525653780.

It is an arithmetic number, because the mean of its divisors is an integer number (76289559858813).

Almost surely, 2^{261564205230212} is an apocalyptic number.

It is an amenable number.

261564205230212 is a deficient number, since it is larger than the sum of its proper divisors (196173153922666).

261564205230212 is a wasteful number, since it uses less digits than its factorization.

261564205230212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65391051307557 (or 65391051307555 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 41.

Adding to 261564205230212 its reverse (212032502465162), we get a palindrome (473596707695374).

The spelling of 261564205230212 in words is "two hundred sixty-one trillion, five hundred sixty-four billion, two hundred five million, two hundred thirty thousand, two hundred twelve".