1819065564 has 36 divisors (see below), whose sum is σ = 4603186224. Its totient is φ = 605696832.

The previous prime is 1819065557. The next prime is 1819065601. The reversal of 1819065564 is 4655609181.

1819065564 is a `hidden beast` number, since 1 + 8 + 1 + 90 + 6 + 556 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1819065564² = 6617999052261276192, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6769 + ... + 60695.

It is an arithmetic number, because the mean of its divisors is an integer number (127866284).

Almost surely, 2^1819065564 is an apocalyptic number.

It is an amenable number.

1819065564 is an abundant number, since it is smaller than the sum of its proper divisors (2784120660).

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

1819065564 is a wasteful number, since it uses less digits than its factorization.

1819065564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54874 (or 54869 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 45.

The square root of 1819065564 is about 42650.5048504704. The cubic root of 1819065564 is about 1220.7201615674.

The spelling of 1819065564 in words is "one billion, eight hundred nineteen million, sixty-five thousand, five hundred sixty-four".