861858405353 has 16 divisors (see below), whose sum is σ = 973059652800. Its totient is φ = 756156098880.

The previous prime is 861858405241. The next prime is 861858405361. The reversal of 861858405353 is 353504858168.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 861858405353 - 2²⁶ = 861791296489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861858485353) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128450 + ... + 1319172.

It is an arithmetic number, because the mean of its divisors is an integer number (60816228300).

Almost surely, 2^861858405353 is an apocalyptic number.

It is an amenable number.

861858405353 is a deficient number, since it is larger than the sum of its proper divisors (111201247447).

861858405353 is a wasteful number, since it uses less digits than its factorization.

861858405353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1193032.

The product of its (nonzero) digits is 13824000, while the sum is 56.

The spelling of 861858405353 in words is "eight hundred sixty-one billion, eight hundred fifty-eight million, four hundred five thousand, three hundred fifty-three".