1634645365321 has 4 divisors (see below), whose sum is σ = 1634649468292. Its totient is φ = 1634641262352.

The previous prime is 1634645365253. The next prime is 1634645365349. The reversal of 1634645365321 is 1235635464361.

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 724309932096 + 910335433225 = 851064^2 + 954115^2 .

It is a cyclic number.

It is not a de Polignac number, because 1634645365321 - 2¹³ = 1634645357129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1634645365361) 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, 1380786 + ... + 2275051.

It is an arithmetic number, because the mean of its divisors is an integer number (408662367073).

Almost surely, 2^{1634645365321} is an apocalyptic number.

It is an amenable number.

1634645365321 is a deficient number, since it is larger than the sum of its proper divisors (4102971).

1634645365321 is an equidigital number, since it uses as much as digits as its factorization.

1634645365321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4102970.

The product of its digits is 4665600, while the sum is 49.

The spelling of 1634645365321 in words is "one trillion, six hundred thirty-four billion, six hundred forty-five million, three hundred sixty-five thousand, three hundred twenty-one".