660440510550 has 120 divisors (see below), whose sum is σ = 1837863726336. Its totient is φ = 175847060160.

The previous prime is 660440510537. The next prime is 660440510599. The reversal of 660440510550 is 55015044066.

660440510550 is a `hidden beast` number, since 6 + 60 + 4 + 40 + 5 + 1 + 0 + 550 = 666.

It is a super-2 number, since 2×660440510550² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 2519787 + ... + 2769513.

Almost surely, 2^660440510550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660440510550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (918931863168).

660440510550 is an abundant number, since it is smaller than the sum of its proper divisors (1177423215786).

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

660440510550 is a wasteful number, since it uses less digits than its factorization.

660440510550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250404 (or 250390 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The spelling of 660440510550 in words is "six hundred sixty billion, four hundred forty million, five hundred ten thousand, five hundred fifty".