823940880461 has 4 divisors (see below), whose sum is σ = 823953862524. Its totient is φ = 823927898400.

The previous prime is 823940880407. The next prime is 823940880491. The reversal of 823940880461 is 164088049328.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 270419760361 + 553521120100 = 520019^2 + 743990^2 .

It is a cyclic number.

It is not a de Polignac number, because 823940880461 - 2¹⁴ = 823940864077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (823940880491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6395360 + ... + 6522921.

It is an arithmetic number, because the mean of its divisors is an integer number (205988465631).

Almost surely, 2^823940880461 is an apocalyptic number.

It is an amenable number.

823940880461 is a deficient number, since it is larger than the sum of its proper divisors (12982063).

823940880461 is a wasteful number, since it uses less digits than its factorization.

823940880461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12982062.

The product of its (nonzero) digits is 2654208, while the sum is 53.

The spelling of 823940880461 in words is "eight hundred twenty-three billion, nine hundred forty million, eight hundred eighty thousand, four hundred sixty-one".