1231266342561 has 8 divisors (see below), whose sum is σ = 1646020090080. Its totient is φ = 818678411712.

The previous prime is 1231266342557. The next prime is 1231266342563. The reversal of 1231266342561 is 1652436621321.

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

It is not a de Polignac number, because 1231266342561 - 2² = 1231266342557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1231266342563) 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, 541452840 + ... + 541455113.

It is an arithmetic number, because the mean of its divisors is an integer number (205752511260).

Almost surely, 2^{1231266342561} is an apocalyptic number.

It is an amenable number.

1231266342561 is a deficient number, since it is larger than the sum of its proper divisors (414753747519).

1231266342561 is a wasteful number, since it uses less digits than its factorization.

1231266342561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082908335.

The product of its digits is 311040, while the sum is 42.

The spelling of 1231266342561 in words is "one trillion, two hundred thirty-one billion, two hundred sixty-six million, three hundred forty-two thousand, five hundred sixty-one".