1565353664 has 28 divisors (see below), whose sum is σ = 3549999504. Its totient is φ = 670865664.

The previous prime is 1565353633. The next prime is 1565353667. The reversal of 1565353664 is 4663535651.

It is a tau number, because it is divible by the number of its divisors (28).

It is not an unprimeable number, because it can be changed into a prime (1565353667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1746599 + ... + 1747494.

Almost surely, 2^1565353664 is an apocalyptic number.

1565353664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1565353664 is an abundant number, since it is smaller than the sum of its proper divisors (1984645840).

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

1565353664 is an equidigital number, since it uses as much as digits as its factorization.

1565353664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3494112 (or 3494102 counting only the distinct ones).

The product of its digits is 972000, while the sum is 44.

The square root of 1565353664 is about 39564.5505977257. The cubic root of 1565353664 is about 1161.1032073093.

The spelling of 1565353664 in words is "one billion, five hundred sixty-five million, three hundred fifty-three thousand, six hundred sixty-four".