1311620002661 has 8 divisors (see below), whose sum is σ = 1380663146880. Its totient is φ = 1242577909728.

The previous prime is 1311620002643. The next prime is 1311620002687. The reversal of 1311620002661 is 1662000261131.

It is a happy number.

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 1311620002661 - 2¹⁸ = 1311619740517 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 (1311620002621) 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, 4742585 + ... + 5011521.

It is an arithmetic number, because the mean of its divisors is an integer number (172582893360).

Almost surely, 2^{1311620002661} is an apocalyptic number.

It is an amenable number.

1311620002661 is a deficient number, since it is larger than the sum of its proper divisors (69043144219).

1311620002661 is a wasteful number, since it uses less digits than its factorization.

1311620002661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525643.

The product of its (nonzero) digits is 2592, while the sum is 29.

Adding to 1311620002661 its reverse (1662000261131), we get a palindrome (2973620263792).

The spelling of 1311620002661 in words is "one trillion, three hundred eleven billion, six hundred twenty million, two thousand, six hundred sixty-one".