1646674966 has 4 divisors (see below), whose sum is σ = 2470012452. Its totient is φ = 823337482.

The previous prime is 1646674963. The next prime is 1646674969. The reversal of 1646674966 is 6694766461.

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

It is an interprime number because it is at equal distance from previous prime (1646674963) and next prime (1646674969).

It is a super-2 number, since 2×1646674966² = 5423076887302202312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1646674963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411668740 + ... + 411668743.

It is an arithmetic number, because the mean of its divisors is an integer number (617503113).

Almost surely, 2^1646674966 is an apocalyptic number.

1646674966 is a deficient number, since it is larger than the sum of its proper divisors (823337486).

1646674966 is an equidigital number, since it uses as much as digits as its factorization.

1646674966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823337485.

The product of its digits is 7838208, while the sum is 55.

The square root of 1646674966 is about 40579.2430437040. The cubic root of 1646674966 is about 1180.8714633943.

The spelling of 1646674966 in words is "one billion, six hundred forty-six million, six hundred seventy-four thousand, nine hundred sixty-six".