655648858 has 4 divisors (see below), whose sum is σ = 983473290. Its totient is φ = 327824428.

The previous prime is 655648831. The next prime is 655648859. The reversal of 655648858 is 858846556.

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

It can be written as a sum of positive squares in only one way, i.e., 446181129 + 209467729 = 21123^2 + 14473^2 .

It is a junction number, because it is equal to n+sod(n) for n = 655648799 and 655648808.

It is not an unprimeable number, because it can be changed into a prime (655648859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 163912213 + ... + 163912216.

Almost surely, 2^655648858 is an apocalyptic number.

655648858 is a deficient number, since it is larger than the sum of its proper divisors (327824432).

655648858 is a wasteful number, since it uses less digits than its factorization.

655648858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327824431.

The product of its digits is 9216000, while the sum is 55.

The square root of 655648858 is about 25605.6411362809. The cubic root of 655648858 is about 868.7412359553.

The spelling of 655648858 in words is "six hundred fifty-five million, six hundred forty-eight thousand, eight hundred fifty-eight".