1640948266 has 8 divisors (see below), whose sum is σ = 2473088544. Its totient is φ = 816585420.

The previous prime is 1640948249. The next prime is 1640948279. The reversal of 1640948266 is 6628490461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1640948266² = 5385422423376813512, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1943830 + ... + 1944673.

It is an arithmetic number, because the mean of its divisors is an integer number (309136068).

Almost surely, 2^1640948266 is an apocalyptic number.

1640948266 is a deficient number, since it is larger than the sum of its proper divisors (832140278).

1640948266 is a wasteful number, since it uses less digits than its factorization.

1640948266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3888716.

The product of its (nonzero) digits is 497664, while the sum is 46.

The square root of 1640948266 is about 40508.6196506373. The cubic root of 1640948266 is about 1179.5009538681.

The spelling of 1640948266 in words is "one billion, six hundred forty million, nine hundred forty-eight thousand, two hundred sixty-six".