660016020040 has 64 divisors (see below), whose sum is σ = 1605492750960. Its totient is φ = 242749931520.

The previous prime is 660016020029. The next prime is 660016020047. The reversal of 660016020040 is 40020610066.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 289794882276 + 370221137764 = 538326^2 + 608458^2 .

It is a super-2 number, since 2×660016020040² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 660016019987 and 660016020014.

It is not an unprimeable number, because it can be changed into a prime (660016020047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2335741 + ... + 2603020.

Almost surely, 2^660016020040 is an apocalyptic number.

It is an amenable number.

660016020040 is an abundant number, since it is smaller than the sum of its proper divisors (945476730920).

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

660016020040 is a wasteful number, since it uses less digits than its factorization.

660016020040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4939042 (or 4939038 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The spelling of 660016020040 in words is "six hundred sixty billion, sixteen million, twenty thousand, forty".