645161290269 has 8 divisors (see below), whose sum is σ = 871103852160. Its totient is φ = 424663127616.

The previous prime is 645161290259. The next prime is 645161290313. The reversal of 645161290269 is 962092161546.

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

It is not a de Polignac number, because 645161290269 - 2¹⁷ = 645161159197 is a prime.

It is a super-2 number, since 2×645161290269² (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 (645161290259) 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, 1361099532 + ... + 1361100005.

It is an arithmetic number, because the mean of its divisors is an integer number (108887981520).

Almost surely, 2^645161290269 is an apocalyptic number.

It is an amenable number.

645161290269 is a deficient number, since it is larger than the sum of its proper divisors (225942561891).

645161290269 is a wasteful number, since it uses less digits than its factorization.

645161290269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2722199619.

The product of its (nonzero) digits is 1399680, while the sum is 51.

The spelling of 645161290269 in words is "six hundred forty-five billion, one hundred sixty-one million, two hundred ninety thousand, two hundred sixty-nine".