655873687 has 4 divisors (see below), whose sum is σ = 749569936. Its totient is φ = 562177440.

The previous prime is 655873667. The next prime is 655873693. The reversal of 655873687 is 786378556.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-655873687 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 (655873667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46848114 + ... + 46848127.

It is an arithmetic number, because the mean of its divisors is an integer number (187392484).

Almost surely, 2^655873687 is an apocalyptic number.

655873687 is a deficient number, since it is larger than the sum of its proper divisors (93696249).

655873687 is an equidigital number, since it uses as much as digits as its factorization.

655873687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93696248.

The product of its digits is 8467200, while the sum is 55.

The square root of 655873687 is about 25610.0309839719. The cubic root of 655873687 is about 868.8405248249.

The spelling of 655873687 in words is "six hundred fifty-five million, eight hundred seventy-three thousand, six hundred eighty-seven".