245374440665 has 4 divisors (see below), whose sum is σ = 294449328804. Its totient is φ = 196299552528.

The previous prime is 245374440637. The next prime is 245374440667. The reversal of 245374440665 is 566044473542.

245374440665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 566044473542 = 2 ⋅283022236771.

It can be written as a sum of positive squares in 2 ways, for example, as 86128749529 + 159245691136 = 293477^2 + 399056^2 .

It is a cyclic number.

It is not a de Polignac number, because 245374440665 - 2¹⁰ = 245374439641 is a prime.

It is a super-2 number, since 2×245374440665² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245374440667) 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, 24537444062 + ... + 24537444071.

It is an arithmetic number, because the mean of its divisors is an integer number (73612332201).

Almost surely, 2^245374440665 is an apocalyptic number.

It is an amenable number.

245374440665 is a deficient number, since it is larger than the sum of its proper divisors (49074888139).

245374440665 is an equidigital number, since it uses as much as digits as its factorization.

245374440665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49074888138.

The product of its (nonzero) digits is 9676800, while the sum is 50.

The spelling of 245374440665 in words is "two hundred forty-five billion, three hundred seventy-four million, four hundred forty thousand, six hundred sixty-five".