660616550 has 48 divisors (see below), whose sum is σ = 1345842432. Its totient is φ = 239258400.

The previous prime is 660616513. The next prime is 660616553. The reversal of 660616550 is 55616066.

It is a super-2 number, since 2×660616550² = 872828452267805000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 660616550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660616553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 142367 + ... + 146933.

It is an arithmetic number, because the mean of its divisors is an integer number (28038384).

Almost surely, 2^660616550 is an apocalyptic number.

660616550 is an abundant number, since it is smaller than the sum of its proper divisors (685225882).

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

660616550 is a wasteful number, since it uses less digits than its factorization.

660616550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4853 (or 4848 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 660616550 is about 25702.4619443352. The cubic root of 660616550 is about 870.9297982061.

It can be divided in two parts, 660616 and 550, that added together give a palindrome (661166).

The spelling of 660616550 in words is "six hundred sixty million, six hundred sixteen thousand, five hundred fifty".