1621712601313 has 6 divisors (see below), whose sum is σ = 1886482005666. Its totient is φ = 1390039372512.

The previous prime is 1621712601241. The next prime is 1621712601323. The reversal of 1621712601313 is 3131062171261.

It can be written as a sum of positive squares in only one way, i.e., 866878309969 + 754834291344 = 931063^2 + 868812^2 .

It is not a de Polignac number, because 1621712601313 - 2¹³ = 1621712593121 is a prime.

It is a super-2 number, since 2×1621712601313² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1621712601323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16548087720 + ... + 16548087817.

It is an arithmetic number, because the mean of its divisors is an integer number (314413667611).

Almost surely, 2^{1621712601313} is an apocalyptic number.

It is an amenable number.

1621712601313 is a deficient number, since it is larger than the sum of its proper divisors (264769404353).

1621712601313 is an equidigital number, since it uses as much as digits as its factorization.

1621712601313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33096175551 (or 33096175544 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 34.

Adding to 1621712601313 its reverse (3131062171261), we get a palindrome (4752774772574).

The spelling of 1621712601313 in words is "one trillion, six hundred twenty-one billion, seven hundred twelve million, six hundred one thousand, three hundred thirteen".