1021642406617 has 6 divisors (see below), whose sum is σ = 1188441166938. Its totient is φ = 875693491344.

The previous prime is 1021642406611. The next prime is 1021642406683. The reversal of 1021642406617 is 7166042461201.

It can be written as a sum of positive squares in only one way, i.e., 820511684041 + 201130722576 = 905821^2 + 448476^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1021642406617 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1021642406617.

It is not an unprimeable number, because it can be changed into a prime (1021642406611) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10424922468 + ... + 10424922565.

It is an arithmetic number, because the mean of its divisors is an integer number (198073527823).

Almost surely, 2^{1021642406617} is an apocalyptic number.

It is an amenable number.

1021642406617 is a deficient number, since it is larger than the sum of its proper divisors (166798760321).

1021642406617 is an equidigital number, since it uses as much as digits as its factorization.

1021642406617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20849845047 (or 20849845040 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

Adding to 1021642406617 its reverse (7166042461201), we get a palindrome (8187684867818).

The spelling of 1021642406617 in words is "one trillion, twenty-one billion, six hundred forty-two million, four hundred six thousand, six hundred seventeen".