1321246125661 has 32 divisors (see below), whose sum is σ = 1748919140352. Its totient is φ = 966340488960.

The previous prime is 1321246125659. The next prime is 1321246125779. The reversal of 1321246125661 is 1665216421231.

It is not a de Polignac number, because 1321246125661 - 2¹ = 1321246125659 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 (1321246125161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 894741 + ... + 1855546.

It is an arithmetic number, because the mean of its divisors is an integer number (54653723136).

Almost surely, 2^{1321246125661} is an apocalyptic number.

1321246125661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1321246125661 is a deficient number, since it is larger than the sum of its proper divisors (427673014691).

1321246125661 is a wasteful number, since it uses less digits than its factorization.

1321246125661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2750689.

The product of its digits is 103680, while the sum is 40.

The spelling of 1321246125661 in words is "one trillion, three hundred twenty-one billion, two hundred forty-six million, one hundred twenty-five thousand, six hundred sixty-one".