661294700713 has 8 divisors (see below), whose sum is σ = 690301426760. Its totient is φ = 632873969280.

The previous prime is 661294700711. The next prime is 661294700723. The reversal of 661294700713 is 317007492166.

661294700713 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 271204517529 + 390090183184 = 520773^2 + 624572^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 661294700713 - 2¹ = 661294700711 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661294700711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146496348 + ... + 146500861.

It is an arithmetic number, because the mean of its divisors is an integer number (86287678345).

Almost surely, 2^661294700713 is an apocalyptic number.

It is an amenable number.

661294700713 is a deficient number, since it is larger than the sum of its proper divisors (29006726047).

661294700713 is a wasteful number, since it uses less digits than its factorization.

661294700713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292997307.

The product of its (nonzero) digits is 381024, while the sum is 46.

The spelling of 661294700713 in words is "six hundred sixty-one billion, two hundred ninety-four million, seven hundred thousand, seven hundred thirteen".