531688047661 has 8 divisors (see below), whose sum is σ = 550228740480. Its totient is φ = 513161129712.

The previous prime is 531688047647. The next prime is 531688047713. The reversal of 531688047661 is 166740886135.

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 531688047661 - 2⁷ = 531688047533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531688047641) 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, 3365145 + ... + 3519598.

It is an arithmetic number, because the mean of its divisors is an integer number (68778592560).

Almost surely, 2^531688047661 is an apocalyptic number.

It is an amenable number.

531688047661 is a deficient number, since it is larger than the sum of its proper divisors (18540692819).

531688047661 is a wasteful number, since it uses less digits than its factorization.

531688047661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6887435.

The product of its (nonzero) digits is 5806080, while the sum is 55.

The spelling of 531688047661 in words is "five hundred thirty-one billion, six hundred eighty-eight million, forty-seven thousand, six hundred sixty-one".