645089166 has 24 divisors (see below), whose sum is σ = 1445890680. Its totient is φ = 207614736.

The previous prime is 645089153. The next prime is 645089167. The reversal of 645089166 is 661980546.

It is a super-2 number, since 2×645089166² = 832280064181151112, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645089167) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 617380 + ... + 618423.

It is an arithmetic number, because the mean of its divisors is an integer number (60245445).

Almost surely, 2^645089166 is an apocalyptic number.

645089166 is an abundant number, since it is smaller than the sum of its proper divisors (800801514).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645089166 is a wasteful number, since it uses less digits than its factorization.

645089166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235840 (or 1235837 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 645089166 is about 25398.6055916462. The cubic root of 645089166 is about 864.0520721574.

The spelling of 645089166 in words is "six hundred forty-five million, eighty-nine thousand, one hundred sixty-six".