1634257745 has 16 divisors (see below), whose sum is σ = 2021776848. Its totient is φ = 1267368960.

The previous prime is 1634257739. The next prime is 1634257747. The reversal of 1634257745 is 5477524361.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 110838784 + 1523418961 = 10528^2 + 39031^2 .

It is not a de Polignac number, because 1634257745 - 2¹⁴ = 1634241361 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1634257696 and 1634257705.

It is not an unprimeable number, because it can be changed into a prime (1634257747) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6797 + ... + 57573.

It is an arithmetic number, because the mean of its divisors is an integer number (126361053).

Almost surely, 2^1634257745 is an apocalyptic number.

It is an amenable number.

1634257745 is a deficient number, since it is larger than the sum of its proper divisors (387519103).

1634257745 is a wasteful number, since it uses less digits than its factorization.

1634257745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50980.

The product of its digits is 705600, while the sum is 44.

The square root of 1634257745 is about 40425.9538539290. The cubic root of 1634257745 is about 1177.8957386516.

The spelling of 1634257745 in words is "one billion, six hundred thirty-four million, two hundred fifty-seven thousand, seven hundred forty-five".