648266079869 has 4 divisors (see below), whose sum is σ = 648706778880. Its totient is φ = 647825380860.

The previous prime is 648266079863. The next prime is 648266079871. The reversal of 648266079869 is 968970662846.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 648266079869 - 2⁸ = 648266079613 is a prime.

It is a super-2 number, since 2×648266079869² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648266079863) 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, 220347299 + ... + 220350240.

It is an arithmetic number, because the mean of its divisors is an integer number (162176694720).

Almost surely, 2^648266079869 is an apocalyptic number.

It is an amenable number.

648266079869 is a deficient number, since it is larger than the sum of its proper divisors (440699011).

648266079869 is a wasteful number, since it uses less digits than its factorization.

648266079869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440699010.

The product of its (nonzero) digits is 376233984, while the sum is 71.

The spelling of 648266079869 in words is "six hundred forty-eight billion, two hundred sixty-six million, seventy-nine thousand, eight hundred sixty-nine".