6436581012 has 36 divisors (see below), whose sum is σ = 16276201396. Its totient is φ = 2144741760.

The previous prime is 6436580989. The next prime is 6436581029. The reversal of 6436581012 is 2101856346.

It is a happy number.

6436581012 is a `hidden beast` number, since 64 + 3 + 6 + 581 + 0 + 12 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5720804496 + 715776516 = 75636^2 + 26754^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 71562 + ... + 134142.

Almost surely, 2^6436581012 is an apocalyptic number.

It is an amenable number.

6436581012 is an abundant number, since it is smaller than the sum of its proper divisors (9839620384).

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

6436581012 is a wasteful number, since it uses less digits than its factorization.

6436581012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65448 (or 65443 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 6436581012 is about 80228.3055535888. The cubic root of 6436581012 is about 1860.1661904921.

The spelling of 6436581012 in words is "six billion, four hundred thirty-six million, five hundred eighty-one thousand, twelve".