839920649461 has 16 divisors (see below), whose sum is σ = 879904819584. Its totient is φ = 800228275264.

The previous prime is 839920649431. The next prime is 839920649479. The reversal of 839920649461 is 164946029938.

It is a cyclic number.

It is not a de Polignac number, because 839920649461 - 2⁵ = 839920649429 is a prime.

It is a super-4 number, since 4×839920649461⁴ (a number of 49 digits) contains 4444 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 839920649461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (839920649431) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 12818595 + ... + 12883951.

It is an arithmetic number, because the mean of its divisors is an integer number (54994051224).

Almost surely, 2^839920649461 is an apocalyptic number.

It is an amenable number.

839920649461 is a deficient number, since it is larger than the sum of its proper divisors (39984170123).

839920649461 is a wasteful number, since it uses less digits than its factorization.

839920649461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67580.

The product of its (nonzero) digits is 20155392, while the sum is 61.

The spelling of 839920649461 in words is "eight hundred thirty-nine billion, nine hundred twenty million, six hundred forty-nine thousand, four hundred sixty-one".