391266068861 has 8 divisors (see below), whose sum is σ = 408930768120. Its totient is φ = 373879554048.

The previous prime is 391266068857. The next prime is 391266068917. The reversal of 391266068861 is 168860662193.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 174561853636 + 216704215225 = 417806^2 + 465515^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 391266068861 - 2² = 391266068857 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 391266068797 and 391266068806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391266068161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69543236 + ... + 69548861.

It is an arithmetic number, because the mean of its divisors is an integer number (51116346015).

Almost surely, 2^391266068861 is an apocalyptic number.

It is an amenable number.

391266068861 is a deficient number, since it is larger than the sum of its proper divisors (17664699259).

391266068861 is a wasteful number, since it uses less digits than its factorization.

391266068861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139092223.

The product of its (nonzero) digits is 4478976, while the sum is 56.

The spelling of 391266068861 in words is "three hundred ninety-one billion, two hundred sixty-six million, sixty-eight thousand, eight hundred sixty-one".