656230728771 has 48 divisors (see below), whose sum is σ = 1028975220000. Its totient is φ = 401638279680.

The previous prime is 656230728761. The next prime is 656230728793. The reversal of 656230728771 is 177827032656.

It is a happy number.

656230728771 is a `hidden beast` number, since 6 + 5 + 623 + 0 + 7 + 2 + 8 + 7 + 7 + 1 = 666.

It is not a de Polignac number, because 656230728771 - 2⁹ = 656230728259 is a prime.

It is not an unprimeable number, because it can be changed into a prime (656230728761) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 730545 + ... + 1358733.

It is an arithmetic number, because the mean of its divisors is an integer number (21436983750).

Almost surely, 2^656230728771 is an apocalyptic number.

656230728771 is a deficient number, since it is larger than the sum of its proper divisors (372744491229).

656230728771 is a wasteful number, since it uses less digits than its factorization.

656230728771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628404 (or 628401 counting only the distinct ones).

The product of its (nonzero) digits is 5927040, while the sum is 54.

The spelling of 656230728771 in words is "six hundred fifty-six billion, two hundred thirty million, seven hundred twenty-eight thousand, seven hundred seventy-one".