1261105510376 has 16 divisors (see below), whose sum is σ = 2409187414500. Its totient is φ = 618655533184.

The previous prime is 1261105510373. The next prime is 1261105510391. The reversal of 1261105510376 is 6730155011621.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1096816344100 + 164289166276 = 1047290^2 + 405326^2 .

It is a super-2 number, since 2×1261105510376² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1261105510373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1487152301 + ... + 1487153148.

Almost surely, 2^{1261105510376} is an apocalyptic number.

It is an amenable number.

1261105510376 is a deficient number, since it is larger than the sum of its proper divisors (1148081904124).

1261105510376 is a wasteful number, since it uses less digits than its factorization.

1261105510376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2974305508 (or 2974305504 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 38.

The spelling of 1261105510376 in words is "one trillion, two hundred sixty-one billion, one hundred five million, five hundred ten thousand, three hundred seventy-six".