261421603312 has 10 divisors (see below), whose sum is σ = 506504356448. Its totient is φ = 130710801648.

The previous prime is 261421603291. The next prime is 261421603321. The reversal of 261421603312 is 213306124162.

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, 8169425088 + ... + 8169425119.

Almost surely, 2^261421603312 is an apocalyptic number.

It is an amenable number.

261421603312 is a deficient number, since it is larger than the sum of its proper divisors (245082753136).

261421603312 is a wasteful number, since it uses less digits than its factorization.

261421603312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16338850215 (or 16338850209 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

Adding to 261421603312 its reverse (213306124162), we get a palindrome (474727727474).

The spelling of 261421603312 in words is "two hundred sixty-one billion, four hundred twenty-one million, six hundred three thousand, three hundred twelve".