1013962621681 has 4 divisors (see below), whose sum is σ = 1014378694132. Its totient is φ = 1013546549232.

The previous prime is 1013962621669. The next prime is 1013962621699. The reversal of 1013962621681 is 1861262693101.

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 783331203600 + 230631418081 = 885060^2 + 480241^2 .

It is a cyclic number.

It is not a de Polignac number, because 1013962621681 - 2¹⁵ = 1013962588913 is a prime.

It is a super-2 number, since 2×1013962621681² (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 (1013962621481) 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 3 ways as a sum of consecutive naturals, for example, 208032570 + ... + 208037443.

It is an arithmetic number, because the mean of its divisors is an integer number (253594673533).

Almost surely, 2^{1013962621681} is an apocalyptic number.

It is an amenable number.

1013962621681 is a deficient number, since it is larger than the sum of its proper divisors (416072451).

1013962621681 is an equidigital number, since it uses as much as digits as its factorization.

1013962621681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416072450.

The product of its (nonzero) digits is 186624, while the sum is 46.

The spelling of 1013962621681 in words is "one trillion, thirteen billion, nine hundred sixty-two million, six hundred twenty-one thousand, six hundred eighty-one".