261212451320 has 16 divisors (see below), whose sum is σ = 587728015560. Its totient is φ = 104484980512.

The previous prime is 261212451299. The next prime is 261212451377. The reversal of 261212451320 is 23154212162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3265155602 + ... + 3265155681.

Almost surely, 2^261212451320 is an apocalyptic number.

261212451320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261212451320 is an abundant number, since it is smaller than the sum of its proper divisors (326515564240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261212451320 is a wasteful number, since it uses less digits than its factorization.

261212451320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6530311294 (or 6530311290 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

Adding to 261212451320 its reverse (23154212162), we get a palindrome (284366663482).

The spelling of 261212451320 in words is "two hundred sixty-one billion, two hundred twelve million, four hundred fifty-one thousand, three hundred twenty".