1646653946 has 16 divisors (see below), whose sum is σ = 2824615680. Its totient is φ = 705263760.

The previous prime is 1646653913. The next prime is 1646653961. The reversal of 1646653946 is 6493566461.

It is a super-2 number, since 2×1646653946² = 5422938435754741832, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1646653894 and 1646653903.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 13586 + ... + 58973.

It is an arithmetic number, because the mean of its divisors is an integer number (176538480).

Almost surely, 2^1646653946 is an apocalyptic number.

1646653946 is a deficient number, since it is larger than the sum of its proper divisors (1177961734).

1646653946 is a wasteful number, since it uses less digits than its factorization.

1646653946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74189.

The product of its digits is 2799360, while the sum is 50.

The square root of 1646653946 is about 40578.9840434676. The cubic root of 1646653946 is about 1180.8664387185.

The spelling of 1646653946 in words is "one billion, six hundred forty-six million, six hundred fifty-three thousand, nine hundred forty-six".