651366 has 12 divisors (see below), whose sum is σ = 1411332. Its totient is φ = 217116.

The previous prime is 651361. The next prime is 651397. The reversal of 651366 is 663156.

651366 is a `hidden beast` number, since 651 + 3 + 6 + 6 = 666.

651366 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651361) by changing a digit.

651366 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18076 + ... + 18111.

It is an arithmetic number, because the mean of its divisors is an integer number (117611).

2⁶⁵¹³⁶⁶ is an apocalyptic number.

651366 is an abundant number, since it is smaller than the sum of its proper divisors (759966).

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

651366 is a wasteful number, since it uses less digits than its factorization.

651366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36195 (or 36192 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 651366 is about 807.0724874508. The cubic root of 651366 is about 86.6845492356.

It can be divided in two parts, 65 and 1366, that added together give a triangular number (1431 = T₅₃).

The spelling of 651366 in words is "six hundred fifty-one thousand, three hundred sixty-six".