1261243028633 has 8 divisors (see below), whose sum is σ = 1444055746752. Its totient is φ = 1079089096176.

The previous prime is 1261243028609. The next prime is 1261243028653. The reversal of 1261243028633 is 3368203421621.

It is a happy number.

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

It is not a de Polignac number, because 1261243028633 - 2²² = 1261238834329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1261243028653) 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, 164692310 + ... + 164699967.

It is an arithmetic number, because the mean of its divisors is an integer number (180506968344).

Almost surely, 2^{1261243028633} is an apocalyptic number.

It is an amenable number.

1261243028633 is a deficient number, since it is larger than the sum of its proper divisors (182812718119).

1261243028633 is an equidigital number, since it uses as much as digits as its factorization.

1261243028633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329392831.

The product of its (nonzero) digits is 248832, while the sum is 41.

The spelling of 1261243028633 in words is "one trillion, two hundred sixty-one billion, two hundred forty-three million, twenty-eight thousand, six hundred thirty-three".