649291966 has 4 divisors (see below), whose sum is σ = 973937952. Its totient is φ = 324645982.

The previous prime is 649291961. The next prime is 649291967. The reversal of 649291966 is 669192946.

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

It is a super-2 number, since 2×649291966² = 843160114224290312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649291961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 162322990 + ... + 162322993.

It is an arithmetic number, because the mean of its divisors is an integer number (243484488).

Almost surely, 2^649291966 is an apocalyptic number.

649291966 is a deficient number, since it is larger than the sum of its proper divisors (324645986).

649291966 is a wasteful number, since it uses less digits than its factorization.

649291966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324645985.

The product of its digits is 1259712, while the sum is 52.

The square root of 649291966 is about 25481.2080953788. The cubic root of 649291966 is about 865.9244645363.

The spelling of 649291966 in words is "six hundred forty-nine million, two hundred ninety-one thousand, nine hundred sixty-six".