645370382385 has 24 divisors (see below), whose sum is σ = 1160073183360. Its totient is φ = 344197536624.

The previous prime is 645370382341. The next prime is 645370382387. The reversal of 645370382385 is 583283073546.

It is a happy number.

645370382385 is a `hidden beast` number, since 6 + 4 + 5 + 370 + 38 + 238 + 5 = 666.

It is not a de Polignac number, because 645370382385 - 2⁷ = 645370382257 is a prime.

It is a super-2 number, since 2×645370382385² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645370382387) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 265583305 + ... + 265585734.

It is an arithmetic number, because the mean of its divisors is an integer number (48336382640).

Almost surely, 2^645370382385 is an apocalyptic number.

It is an amenable number.

645370382385 is a deficient number, since it is larger than the sum of its proper divisors (514702800975).

645370382385 is an equidigital number, since it uses as much as digits as its factorization.

645370382385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531169059 (or 531169047 counting only the distinct ones).

The product of its (nonzero) digits is 14515200, while the sum is 54.

The spelling of 645370382385 in words is "six hundred forty-five billion, three hundred seventy million, three hundred eighty-two thousand, three hundred eighty-five".