261220545112 has 8 divisors (see below), whose sum is σ = 489788522100. Its totient is φ = 130610272552.

The previous prime is 261220545109. The next prime is 261220545137. The reversal of 261220545112 is 211545022162.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×261220545112² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16326284062 + ... + 16326284077.

Almost surely, 2^261220545112 is an apocalyptic number.

It is an amenable number.

261220545112 is a deficient number, since it is larger than the sum of its proper divisors (228567976988).

261220545112 is a wasteful number, since it uses less digits than its factorization.

261220545112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32652568145 (or 32652568141 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

Adding to 261220545112 its reverse (211545022162), we get a palindrome (472765567274).

The spelling of 261220545112 in words is "two hundred sixty-one billion, two hundred twenty million, five hundred forty-five thousand, one hundred twelve".