645476345 has 16 divisors (see below), whose sum is σ = 803370960. Its totient is φ = 497274624.

The previous prime is 645476339. The next prime is 645476371. The reversal of 645476345 is 543674546.

It can be written as a sum of positive squares in 8 ways, for example, as 44049769 + 601426576 = 6637^2 + 24524^2 .

It is a cyclic number.

It is not a de Polignac number, because 645476345 - 2¹² = 645472249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 645476296 and 645476305.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51959 + ... + 63171.

It is an arithmetic number, because the mean of its divisors is an integer number (50210685).

Almost surely, 2^645476345 is an apocalyptic number.

It is an amenable number.

645476345 is a deficient number, since it is larger than the sum of its proper divisors (157894615).

645476345 is a wasteful number, since it uses less digits than its factorization.

645476345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11644.

The product of its digits is 1209600, while the sum is 44.

The square root of 645476345 is about 25406.2265006041. The cubic root of 645476345 is about 864.2249040319.

The spelling of 645476345 in words is "six hundred forty-five million, four hundred seventy-six thousand, three hundred forty-five".