645531266519 has 8 divisors (see below), whose sum is σ = 673846552608. Its totient is φ = 617788006560.

The previous prime is 645531266507. The next prime is 645531266581. The reversal of 645531266519 is 915662135546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645531266519 - 2⁴ = 645531266503 is a prime.

It is a super-2 number, since 2×645531266519² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645531256519) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143004227 + ... + 143008740.

It is an arithmetic number, because the mean of its divisors is an integer number (84230819076).

Almost surely, 2^645531266519 is an apocalyptic number.

645531266519 is a deficient number, since it is larger than the sum of its proper divisors (28315286089).

645531266519 is a wasteful number, since it uses less digits than its factorization.

645531266519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286013065.

The product of its digits is 5832000, while the sum is 53.

The spelling of 645531266519 in words is "six hundred forty-five billion, five hundred thirty-one million, two hundred sixty-six thousand, five hundred nineteen".