645532140231 has 48 divisors (see below), whose sum is σ = 1028080404000. Its totient is φ = 387069096960.

The previous prime is 645532140223. The next prime is 645532140241. The reversal of 645532140231 is 132041235546.

645532140231 is a `hidden beast` number, since 6 + 455 + 32 + 140 + 2 + 31 = 666.

645532140231 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 645532140231 - 2³ = 645532140223 is a prime.

It is a super-2 number, since 2×645532140231² (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 (645532140241) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3532395 + ... + 3710643.

It is an arithmetic number, because the mean of its divisors is an integer number (21418341750).

Almost surely, 2^645532140231 is an apocalyptic number.

645532140231 is a deficient number, since it is larger than the sum of its proper divisors (382548263769).

645532140231 is a wasteful number, since it uses less digits than its factorization.

645532140231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178656 (or 178653 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

Adding to 645532140231 its reverse (132041235546), we get a palindrome (777573375777).

The spelling of 645532140231 in words is "six hundred forty-five billion, five hundred thirty-two million, one hundred forty thousand, two hundred thirty-one".