1261105106650 has 12 divisors (see below), whose sum is σ = 2345655498462. Its totient is φ = 504442042640.

The previous prime is 1261105106629. The next prime is 1261105106663. The reversal of 1261105106650 is 566015011621.

It can be written as a sum of positive squares in 3 ways, for example, as 1171020486769 + 90084619881 = 1082137^2 + 300141^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12611051017 + ... + 12611051116.

Almost surely, 2^{1261105106650} is an apocalyptic number.

1261105106650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1261105106650 is a deficient number, since it is larger than the sum of its proper divisors (1084550391812).

1261105106650 is a wasteful number, since it uses less digits than its factorization.

1261105106650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25222102145 (or 25222102140 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 34.

The spelling of 1261105106650 in words is "one trillion, two hundred sixty-one billion, one hundred five million, one hundred six thousand, six hundred fifty".