666737336740 has 48 divisors (see below), whose sum is σ = 1443336375600. Its totient is φ = 258522250752.

The previous prime is 666737336723. The next prime is 666737336743. The reversal of 666737336740 is 47633737666.

It can be written as a sum of positive squares in 8 ways, for example, as 48724381696 + 618012955044 = 220736^2 + 786138^2 .

It is not an unprimeable number, because it can be changed into a prime (666737336743) 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, 1475655 + ... + 1873774.

It is an arithmetic number, because the mean of its divisors is an integer number (30069507825).

Almost surely, 2^666737336740 is an apocalyptic number.

It is an amenable number.

666737336740 is an abundant number, since it is smaller than the sum of its proper divisors (776599038860).

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

666737336740 is a wasteful number, since it uses less digits than its factorization.

666737336740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3349744 (or 3349742 counting only the distinct ones).

The product of its (nonzero) digits is 48009024, while the sum is 58.

The spelling of 666737336740 in words is "six hundred sixty-six billion, seven hundred thirty-seven million, three hundred thirty-six thousand, seven hundred forty".