645340232133 has 16 divisors (see below), whose sum is σ = 986900236800. Its totient is φ = 416348536320.

The previous prime is 645340232123. The next prime is 645340232143. The reversal of 645340232133 is 331232043546.

645340232133 is a `hidden beast` number, since 6 + 453 + 40 + 2 + 32 + 133 = 666.

It is an interprime number because it is at equal distance from previous prime (645340232123) and next prime (645340232143).

It is not a de Polignac number, because 645340232133 - 2⁹ = 645340231621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645340232123) 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, 385507068 + ... + 385508741.

It is an arithmetic number, because the mean of its divisors is an integer number (61681264800).

Almost surely, 2^645340232133 is an apocalyptic number.

It is an amenable number.

645340232133 is a deficient number, since it is larger than the sum of its proper divisors (341560004667).

645340232133 is a wasteful number, since it uses less digits than its factorization.

645340232133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771015849 (or 771015843 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 36.

Adding to 645340232133 its reverse (331232043546), we get a palindrome (976572275679).

The spelling of 645340232133 in words is "six hundred forty-five billion, three hundred forty million, two hundred thirty-two thousand, one hundred thirty-three".