811649639056 has 45 divisors (see below), whose sum is σ = 1593287966403. Its totient is φ = 400547253600.

The previous prime is 811649638991. The next prime is 811649639063. The reversal of 811649639056 is 650936946118.

It is a happy number.

The square root of 811649639056 is 900916.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×811649639056² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 284688031 + ... + 284690881.

Almost surely, 2^811649639056 is an apocalyptic number.

811649639056 is the 900916-th square number.

It is an amenable number.

811649639056 is a deficient number, since it is larger than the sum of its proper divisors (781638327347).

811649639056 is an frugal number, since it uses more digits than its factorization.

811649639056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5868 (or 2932 counting only the distinct ones).

The product of its (nonzero) digits is 8398080, while the sum is 58.

The spelling of 811649639056 in words is "eight hundred eleven billion, six hundred forty-nine million, six hundred thirty-nine thousand, fifty-six".