1243064426261 has 8 divisors (see below), whose sum is σ = 1420663035264. Its totient is φ = 1065470311440.

The previous prime is 1243064426239. The next prime is 1243064426267. The reversal of 1243064426261 is 1626244603421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1243064426261 - 2³⁸ = 968186519317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243064426267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 508385 + ... + 1656678.

It is an arithmetic number, because the mean of its divisors is an integer number (177582879408).

Almost surely, 2^{1243064426261} is an apocalyptic number.

It is an amenable number.

1243064426261 is a deficient number, since it is larger than the sum of its proper divisors (177598609003).

1243064426261 is an equidigital number, since it uses as much as digits as its factorization.

1243064426261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2247091.

The product of its (nonzero) digits is 331776, while the sum is 41.

The spelling of 1243064426261 in words is "one trillion, two hundred forty-three billion, sixty-four million, four hundred twenty-six thousand, two hundred sixty-one".