660421336 has 32 divisors (see below), whose sum is σ = 1251924480. Its totient is φ = 326592000.

The previous prime is 660421331. The next prime is 660421343. The reversal of 660421336 is 633124066.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 660421298 and 660421307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660421331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 406606 + ... + 408226.

It is an arithmetic number, because the mean of its divisors is an integer number (39122640).

Almost surely, 2^660421336 is an apocalyptic number.

It is an amenable number.

660421336 is a deficient number, since it is larger than the sum of its proper divisors (591503144).

660421336 is a wasteful number, since it uses less digits than its factorization.

660421336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2155 (or 2151 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 660421336 is about 25698.6640897927. The cubic root of 660421336 is about 870.8440023743.

The spelling of 660421336 in words is "six hundred sixty million, four hundred twenty-one thousand, three hundred thirty-six".