1634353645 has 4 divisors (see below), whose sum is σ = 1961224380. Its totient is φ = 1307482912.

The previous prime is 1634353597. The next prime is 1634353687. The reversal of 1634353645 is 5463534361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5463534361 = 20107 ⋅271723.

It can be written as a sum of positive squares in 2 ways, for example, as 363359844 + 1270993801 = 19062^2 + 35651^2 .

It is a cyclic number.

It is not a de Polignac number, because 1634353645 - 2⁷ = 1634353517 is a prime.

It is a super-3 number, since 3×1634353645³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 1634353598 and 1634353607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163435360 + ... + 163435369.

It is an arithmetic number, because the mean of its divisors is an integer number (490306095).

Almost surely, 2^1634353645 is an apocalyptic number.

It is an amenable number.

1634353645 is a deficient number, since it is larger than the sum of its proper divisors (326870735).

1634353645 is an equidigital number, since it uses as much as digits as its factorization.

1634353645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326870734.

The product of its digits is 388800, while the sum is 40.

The square root of 1634353645 is about 40427.1399557278. The cubic root of 1634353645 is about 1177.9187782634.

The spelling of 1634353645 in words is "one billion, six hundred thirty-four million, three hundred fifty-three thousand, six hundred forty-five".