648997659 has 12 divisors (see below), whose sum is σ = 938663856. Its totient is φ = 432100752.

The previous prime is 648997639. The next prime is 648997673. The reversal of 648997659 is 956799846.

It is a happy number.

648997659 is a `hidden beast` number, since 6 + 489 + 97 + 65 + 9 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-648997659 is a prime.

It is a super-2 number, since 2×648997659² = 842395922774960562, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 648997596 and 648997605.

It is not an unprimeable number, because it can be changed into a prime (648997639) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39687 + ... + 53600.

It is an arithmetic number, because the mean of its divisors is an integer number (78221988).

Almost surely, 2^648997659 is an apocalyptic number.

648997659 is a deficient number, since it is larger than the sum of its proper divisors (289666197).

648997659 is a wasteful number, since it uses less digits than its factorization.

648997659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94066 (or 94063 counting only the distinct ones).

The product of its digits is 29393280, while the sum is 63.

The square root of 648997659 is about 25475.4324595285. The cubic root of 648997659 is about 865.7936111556.

The spelling of 648997659 in words is "six hundred forty-eight million, nine hundred ninety-seven thousand, six hundred fifty-nine".