660103920 has 120 divisors (see below), whose sum is σ = 2533561056. Its totient is φ = 150879744.

The previous prime is 660103919. The next prime is 660103943. The reversal of 660103920 is 29301066.

It is a happy number.

660103920 is a `hidden beast` number, since 6 + 601 + 0 + 39 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60447 + ... + 70526.

Almost surely, 2^660103920 is an apocalyptic number.

660103920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

660103920 is an abundant number, since it is smaller than the sum of its proper divisors (1873457136).

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

660103920 is a wasteful number, since it uses less digits than its factorization.

660103920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130999 (or 130990 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 660103920 is about 25692.4876179789. The cubic root of 660103920 is about 870.7044631128.

Adding to 660103920 its reverse (29301066), we get a palindrome (689404986).

The spelling of 660103920 in words is "six hundred sixty million, one hundred three thousand, nine hundred twenty".