651660 has 24 divisors (see below), whose sum is σ = 1824816. Its totient is φ = 173760.

The previous prime is 651649. The next prime is 651667. The reversal of 651660 is 66156.

651660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 651660.

It is not an unprimeable number, because it can be changed into a prime (651667) by changing a digit.

651660 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 7 ways as a sum of consecutive naturals, for example, 5371 + ... + 5490.

It is an arithmetic number, because the mean of its divisors is an integer number (76034).

2⁶⁵¹⁶⁶⁰ is an apocalyptic number.

651660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

651660 is an abundant number, since it is smaller than the sum of its proper divisors (1173156).

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

651660 is a wasteful number, since it uses less digits than its factorization.

651660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10873 (or 10871 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 651660 is about 807.2546066762. The cubic root of 651660 is about 86.6975892285.

The spelling of 651660 in words is "six hundred fifty-one thousand, six hundred sixty".