649016669 has 4 divisors (see below), whose sum is σ = 741733344. Its totient is φ = 556299996.

The previous prime is 649016657. The next prime is 649016671. The reversal of 649016669 is 966610946.

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 not a de Polignac number, because 649016669 - 2⁴ = 649016653 is a prime.

It is a super-2 number, since 2×649016669² = 842445273279711122, which 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 (649010669) 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, 46358327 + ... + 46358340.

It is an arithmetic number, because the mean of its divisors is an integer number (185433336).

Almost surely, 2^649016669 is an apocalyptic number.

It is an amenable number.

649016669 is a deficient number, since it is larger than the sum of its proper divisors (92716675).

649016669 is an equidigital number, since it uses as much as digits as its factorization.

649016669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92716674.

The product of its (nonzero) digits is 419904, while the sum is 47.

The square root of 649016669 is about 25475.8055613557. The cubic root of 649016669 is about 865.8020644865.

The spelling of 649016669 in words is "six hundred forty-nine million, sixteen thousand, six hundred sixty-nine".