1361016265621 has 4 divisors (see below), whose sum is σ = 1361019365452. Its totient is φ = 1361013165792.

The previous prime is 1361016265619. The next prime is 1361016265633. The reversal of 1361016265621 is 1265626101631.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1049981398596 + 311034867025 = 1024686^2 + 557705^2 .

It is a cyclic number.

It is not a de Polignac number, because 1361016265621 - 2¹ = 1361016265619 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 (1361016265601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 755646 + ... + 1814671.

It is an arithmetic number, because the mean of its divisors is an integer number (340254841363).

Almost surely, 2^{1361016265621} is an apocalyptic number.

It is an amenable number.

1361016265621 is a deficient number, since it is larger than the sum of its proper divisors (3099831).

1361016265621 is an equidigital number, since it uses as much as digits as its factorization.

1361016265621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3099830.

The product of its (nonzero) digits is 77760, while the sum is 40.

The spelling of 1361016265621 in words is "one trillion, three hundred sixty-one billion, sixteen million, two hundred sixty-five thousand, six hundred twenty-one".