1261151161304 has 32 divisors (see below), whose sum is σ = 2416468662720. Its totient is φ = 616776166656.

The previous prime is 1261151161297. The next prime is 1261151161313. The reversal of 1261151161304 is 4031611511621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 433229 + ... + 1646204.

It is an arithmetic number, because the mean of its divisors is an integer number (75514645710).

Almost surely, 2^{1261151161304} is an apocalyptic number.

It is an amenable number.

1261151161304 is a deficient number, since it is larger than the sum of its proper divisors (1155317501416).

1261151161304 is a wasteful number, since it uses less digits than its factorization.

1261151161304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2081099 (or 2081095 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 32.

Adding to 1261151161304 its reverse (4031611511621), we get a palindrome (5292762672925).

The spelling of 1261151161304 in words is "one trillion, two hundred sixty-one billion, one hundred fifty-one million, one hundred sixty-one thousand, three hundred four".