1564481645 has 16 divisors (see below), whose sum is σ = 1895013120. Its totient is φ = 1239883200.

The previous prime is 1564481629. The next prime is 1564481651. The reversal of 1564481645 is 5461844651.

It is a happy number.

It is not a de Polignac number, because 1564481645 - 2⁴ = 1564481629 is a prime.

It is a super-3 number, since 3×1564481645³ (a number of 29 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1564481596 and 1564481605.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 242066 + ... + 248444.

It is an arithmetic number, because the mean of its divisors is an integer number (118438320).

Almost surely, 2^1564481645 is an apocalyptic number.

It is an amenable number.

1564481645 is a deficient number, since it is larger than the sum of its proper divisors (330531475).

1564481645 is a wasteful number, since it uses less digits than its factorization.

1564481645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6836.

The product of its digits is 460800, while the sum is 44.

The square root of 1564481645 is about 39553.5288564750. The cubic root of 1564481645 is about 1160.8875601678.

The spelling of 1564481645 in words is "one billion, five hundred sixty-four million, four hundred eighty-one thousand, six hundred forty-five".