645082781469 has 16 divisors (see below), whose sum is σ = 985172572800. Its totient is φ = 367797749760.

The previous prime is 645082781449. The next prime is 645082781503. The reversal of 645082781469 is 964187280546.

It is a happy number.

It is not a de Polignac number, because 645082781469 - 2⁹ = 645082780957 is a prime.

It is a super-2 number, since 2×645082781469² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645082781449) 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, 34197952 + ... + 34216809.

It is an arithmetic number, because the mean of its divisors is an integer number (61573285800).

Almost surely, 2^645082781469 is an apocalyptic number.

It is an amenable number.

645082781469 is a deficient number, since it is larger than the sum of its proper divisors (340089791331).

645082781469 is a wasteful number, since it uses less digits than its factorization.

645082781469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68415220.

The product of its (nonzero) digits is 23224320, while the sum is 60.

The spelling of 645082781469 in words is "six hundred forty-five billion, eighty-two million, seven hundred eighty-one thousand, four hundred sixty-nine".