645634341441 has 12 divisors (see below), whose sum is σ = 987440757732. Its totient is φ = 405103900416.

The previous prime is 645634341421. The next prime is 645634341493. The reversal of 645634341441 is 144143436546.

645634341441 is a `hidden beast` number, since 6 + 4 + 5 + 634 + 3 + 4 + 1 + 4 + 4 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 312017202225 + 333617139216 = 558585^2 + 577596^2 .

It is not a de Polignac number, because 645634341441 - 2¹¹ = 645634339393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645634341421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2109915996 + ... + 2109916301.

It is an arithmetic number, because the mean of its divisors is an integer number (82286729811).

Almost surely, 2^645634341441 is an apocalyptic number.

It is an amenable number.

645634341441 is a deficient number, since it is larger than the sum of its proper divisors (341806416291).

645634341441 is a wasteful number, since it uses less digits than its factorization.

645634341441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4219832320 (or 4219832317 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 45.

Adding to 645634341441 its reverse (144143436546), we get a palindrome (789777777987).

The spelling of 645634341441 in words is "six hundred forty-five billion, six hundred thirty-four million, three hundred forty-one thousand, four hundred forty-one".