811764651472 has 20 divisors (see below), whose sum is σ = 1572863293476. Its totient is φ = 405864446720.

The previous prime is 811764651461. The next prime is 811764651493. The reversal of 811764651472 is 274156467118.

It can be written as a sum of positive squares in 2 ways, for example, as 322106191936 + 489658459536 = 567544^2 + 699756^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 738979 + ... + 1472962.

Almost surely, 2^811764651472 is an apocalyptic number.

It is an amenable number.

811764651472 is a deficient number, since it is larger than the sum of its proper divisors (761098642004).

811764651472 is a wasteful number, since it uses less digits than its factorization.

811764651472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2234886 (or 2234880 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 52.

The spelling of 811764651472 in words is "eight hundred eleven billion, seven hundred sixty-four million, six hundred fifty-one thousand, four hundred seventy-two".