645167043 has 12 divisors (see below), whose sum is σ = 972426000. Its totient is φ = 411410736.

The previous prime is 645167041. The next prime is 645167057. The reversal of 645167043 is 340761546.

It is a happy number.

645167043 is a `hidden beast` number, since 645 + 1 + 6 + 7 + 0 + 4 + 3 = 666.

It is not a de Polignac number, because 645167043 - 2¹ = 645167041 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 645166989 and 645167007.

It is not an unprimeable number, because it can be changed into a prime (645167041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1558168 + ... + 1558581.

It is an arithmetic number, because the mean of its divisors is an integer number (81035500).

Almost surely, 2^645167043 is an apocalyptic number.

645167043 is a deficient number, since it is larger than the sum of its proper divisors (327258957).

645167043 is a wasteful number, since it uses less digits than its factorization.

645167043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3116778 (or 3116775 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 645167043 is about 25400.1386413539. The cubic root of 645167043 is about 864.0868410334.

The spelling of 645167043 in words is "six hundred forty-five million, one hundred sixty-seven thousand, forty-three".