659551440 has 40 divisors (see below), whose sum is σ = 2044610208. Its totient is φ = 175880320.

The previous prime is 659551433. The next prime is 659551457. The reversal of 659551440 is 44155956.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

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, 1373826 + ... + 1374305.

Almost surely, 2^659551440 is an apocalyptic number.

659551440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

659551440 is an abundant number, since it is smaller than the sum of its proper divisors (1385058768).

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

659551440 is a wasteful number, since it uses less digits than its factorization.

659551440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2748147 (or 2748141 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 39.

The square root of 659551440 is about 25681.7335863450. The cubic root of 659551440 is about 870.4614806292.

The spelling of 659551440 in words is "six hundred fifty-nine million, five hundred fifty-one thousand, four hundred forty".