819944464536 has 24 divisors (see below), whose sum is σ = 2220682924980. Its totient is φ = 273314821488.

The previous prime is 819944464489. The next prime is 819944464541. The reversal of 819944464536 is 635464449918.

It is a happy number.

819944464536 is a `hidden beast` number, since 8 + 1 + 9 + 94 + 4 + 4 + 6 + 4 + 536 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5694058710 + ... + 5694058853.

Almost surely, 2^819944464536 is an apocalyptic number.

It is an amenable number.

819944464536 is an abundant number, since it is smaller than the sum of its proper divisors (1400738460444).

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

819944464536 is a wasteful number, since it uses less digits than its factorization.

819944464536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11388117575 (or 11388117568 counting only the distinct ones).

The product of its digits is 89579520, while the sum is 63.

The spelling of 819944464536 in words is "eight hundred nineteen billion, nine hundred forty-four million, four hundred sixty-four thousand, five hundred thirty-six".