660653990 has 16 divisors (see below), whose sum is σ = 1194419952. Its totient is φ = 263096544.

The previous prime is 660653977. The next prime is 660654041. The reversal of 660653990 is 99356066.

660653990 is digitally balanced in base 2 and base 6, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143249 + ... + 147788.

It is an arithmetic number, because the mean of its divisors is an integer number (74651247).

Almost surely, 2^660653990 is an apocalyptic number.

660653990 is a deficient number, since it is larger than the sum of its proper divisors (533765962).

660653990 is a wasteful number, since it uses less digits than its factorization.

660653990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291271.

The product of its (nonzero) digits is 262440, while the sum is 44.

The square root of 660653990 is about 25703.1902689141. The cubic root of 660653990 is about 870.9462510161.

The spelling of 660653990 in words is "six hundred sixty million, six hundred fifty-three thousand, nine hundred ninety".