687432240661 has 8 divisors (see below), whose sum is σ = 688384319040. Its totient is φ = 686480416608.

The previous prime is 687432240653. The next prime is 687432240673. The reversal of 687432240661 is 166042234786.

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 687432240661 - 2³ = 687432240653 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 (687432240611) 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, 5706130 + ... + 5825356.

It is an arithmetic number, because the mean of its divisors is an integer number (86048039880).

Almost surely, 2^687432240661 is an apocalyptic number.

It is an amenable number.

687432240661 is a deficient number, since it is larger than the sum of its proper divisors (952078379).

687432240661 is a wasteful number, since it uses less digits than its factorization.

687432240661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127163.

The product of its (nonzero) digits is 2322432, while the sum is 49.

The spelling of 687432240661 in words is "six hundred eighty-seven billion, four hundred thirty-two million, two hundred forty thousand, six hundred sixty-one".