610607806821 has 12 divisors (see below), whose sum is σ = 882401034060. Its totient is φ = 406881726720.

The previous prime is 610607806793. The next prime is 610607806841. The reversal of 610607806821 is 128608706016.

It is a happy number.

610607806821 is a `hidden beast` number, since 6 + 10 + 607 + 8 + 0 + 6 + 8 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 494131673025 + 116476133796 = 702945^2 + 341286^2 .

It is not a de Polignac number, because 610607806821 - 2¹¹ = 610607804773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (610607806841) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15825036 + ... + 15863573.

It is an arithmetic number, because the mean of its divisors is an integer number (73533419505).

Almost surely, 2^610607806821 is an apocalyptic number.

It is an amenable number.

610607806821 is a deficient number, since it is larger than the sum of its proper divisors (271793227239).

610607806821 is a wasteful number, since it uses less digits than its factorization.

610607806821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31690756 (or 31690753 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The spelling of 610607806821 in words is "six hundred ten billion, six hundred seven million, eight hundred six thousand, eight hundred twenty-one".