1649565312 has 64 divisors (see below), whose sum is σ = 4483601760. Its totient is φ = 537062400.

The previous prime is 1649565289. The next prime is 1649565317. The reversal of 1649565312 is 2135659461.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (1649565317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33439 + ... + 66462.

Almost surely, 2^1649565312 is an apocalyptic number.

1649565312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1649565312 is an abundant number, since it is smaller than the sum of its proper divisors (2834036448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1649565312 is an equidigital number, since it uses as much as digits as its factorization.

1649565312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99961 (or 99949 counting only the distinct ones).

The product of its digits is 194400, while the sum is 42.

The square root of 1649565312 is about 40614.8410313275. The cubic root of 1649565312 is about 1181.5619724805.

The spelling of 1649565312 in words is "one billion, six hundred forty-nine million, five hundred sixty-five thousand, three hundred twelve".