665433036545 has 4 divisors (see below), whose sum is σ = 798519643860. Its totient is φ = 532346429232.

The previous prime is 665433036517. The next prime is 665433036551. The reversal of 665433036545 is 545630334566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 545630334566 = 2 ⋅272815167283.

It can be written as a sum of positive squares in 2 ways, for example, as 504793198144 + 160639838401 = 710488^2 + 400799^2 .

It is a cyclic number.

It is not a de Polignac number, because 665433036545 - 2¹² = 665433032449 is a prime.

It is a super-2 number, since 2×665433036545² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 665433036493 and 665433036502.

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, 66543303650 + ... + 66543303659.

It is an arithmetic number, because the mean of its divisors is an integer number (199629910965).

Almost surely, 2^665433036545 is an apocalyptic number.

It is an amenable number.

665433036545 is a deficient number, since it is larger than the sum of its proper divisors (133086607315).

665433036545 is a wasteful number, since it uses less digits than its factorization.

665433036545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133086607314.

The product of its (nonzero) digits is 11664000, while the sum is 50.

The spelling of 665433036545 in words is "six hundred sixty-five billion, four hundred thirty-three million, thirty-six thousand, five hundred forty-five".