1261246426442 has 16 divisors (see below), whose sum is σ = 1938044896200. Its totient is φ = 615231970560.

The previous prime is 1261246426421. The next prime is 1261246426487. The reversal of 1261246426442 is 2446246421621.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 348325416481 + 912921009961 = 590191^2 + 955469^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1261246426393 and 1261246426402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7989734 + ... + 8146062.

Almost surely, 2^{1261246426442} is an apocalyptic number.

1261246426442 is a deficient number, since it is larger than the sum of its proper divisors (676798469758).

1261246426442 is a wasteful number, since it uses less digits than its factorization.

1261246426442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254761.

The product of its digits is 884736, while the sum is 44.

The spelling of 1261246426442 in words is "one trillion, two hundred sixty-one billion, two hundred forty-six million, four hundred twenty-six thousand, four hundred forty-two".