810885906772 has 6 divisors (see below), whose sum is σ = 1419050336858. Its totient is φ = 405442953384.

The previous prime is 810885906767. The next prime is 810885906959. The reversal of 810885906772 is 277609588018.

It can be written as a sum of positive squares in only one way, i.e., 687682098756 + 123203808016 = 829266^2 + 351004^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 810885906772.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101360738343 + ... + 101360738350.

Almost surely, 2^810885906772 is an apocalyptic number.

It is an amenable number.

810885906772 is a deficient number, since it is larger than the sum of its proper divisors (608164430086).

810885906772 is a wasteful number, since it uses less digits than its factorization.

810885906772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202721476697 (or 202721476695 counting only the distinct ones).

The product of its (nonzero) digits is 13547520, while the sum is 61.

The spelling of 810885906772 in words is "eight hundred ten billion, eight hundred eighty-five million, nine hundred six thousand, seven hundred seventy-two".