6436772813 has 4 divisors (see below), whose sum is σ = 6586465248. Its totient is φ = 6287080380.

The previous prime is 6436772803. The next prime is 6436772833. The reversal of 6436772813 is 3182776346.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6436772813 - 2¹⁴ = 6436756429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6436772803) 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, 74846153 + ... + 74846238.

It is an arithmetic number, because the mean of its divisors is an integer number (1646616312).

Almost surely, 2^6436772813 is an apocalyptic number.

It is an amenable number.

6436772813 is a deficient number, since it is larger than the sum of its proper divisors (149692435).

6436772813 is a wasteful number, since it uses less digits than its factorization.

6436772813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149692434.

The product of its digits is 1016064, while the sum is 47.

The square root of 6436772813 is about 80229.5008896354. The cubic root of 6436772813 is about 1860.1846670814.

The spelling of 6436772813 in words is "six billion, four hundred thirty-six million, seven hundred seventy-two thousand, eight hundred thirteen".