660542550 has 24 divisors (see below), whose sum is σ = 1638145896. Its totient is φ = 176144640.

The previous prime is 660542539. The next prime is 660542563. The reversal of 660542550 is 55245066.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2201659 + ... + 2201958.

It is an arithmetic number, because the mean of its divisors is an integer number (68256079).

Almost surely, 2^660542550 is an apocalyptic number.

660542550 is an abundant number, since it is smaller than the sum of its proper divisors (977603346).

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

660542550 is a wasteful number, since it uses less digits than its factorization.

660542550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4403632 (or 4403627 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 33.

The square root of 660542550 is about 25701.0223532061. The cubic root of 660542550 is about 870.8972774689.

The spelling of 660542550 in words is "six hundred sixty million, five hundred forty-two thousand, five hundred fifty".