811523646813 has 16 divisors (see below), whose sum is σ = 1202669695296. Its totient is φ = 482552653440.

The previous prime is 811523646761. The next prime is 811523646823. The reversal of 811523646813 is 318646325118.

It is not a de Polignac number, because 811523646813 - 2⁶ = 811523646749 is a prime.

It is a super-3 number, since 3×811523646813³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811523646823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 231994720 + ... + 231998217.

It is an arithmetic number, because the mean of its divisors is an integer number (75166855956).

Almost surely, 2^811523646813 is an apocalyptic number.

It is an amenable number.

811523646813 is a deficient number, since it is larger than the sum of its proper divisors (391146048483).

811523646813 is a wasteful number, since it uses less digits than its factorization.

811523646813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463993004.

The product of its digits is 829440, while the sum is 48.

The spelling of 811523646813 in words is "eight hundred eleven billion, five hundred twenty-three million, six hundred forty-six thousand, eight hundred thirteen".